docs: setup base documentation website (#277)

* docussaurus initial setup

* base docussaurus config

* add base gh-pages deployment action

* remove unnecessary job step

* test changing baseurl

* fix last commit

* fix last commit

* remove trailing slash

* fix baseUrl config

* add basic content based on readme

* use yarn in gh-pages action

Co-authored-by: Maciej Małkowski <monkey3310@gmail.com>

.github/workflows/gh-pages.yml

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+name: deploy-docs
+
+on:
+  push:
+    branches:
+    - alpha # replace with master once merged
+
+# install dependencies, build, and push to `gh-pages`
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        persist-credentials: false
+
+    - name: Install and build
+      working-directory: docs
+      run: |
+        yarn
+        yarn build
+
+    - name: Deploy to gh-pages
+      uses: JamesIves/github-pages-deploy-action@3.7.1
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        BRANCH: gh-pages 
+        FOLDER: docs/build 
+        CLEAN: true 

docs/.gitignore

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+# Dependencies
+/node_modules
+
+# Production
+/build
+
+# Generated files
+.docusaurus
+.cache-loader
+
+# Misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

docs/README.md

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+# Website
+
+This website is built using [Docusaurus 2](https://v2.docusaurus.io/), a modern static website generator.
+
+## Installation
+
+```console
+yarn install
+```
+
+## Local Development
+
+```console
+yarn start
+```
+
+This command starts a local development server and open up a browser window. Most changes are reflected live without having to restart the server.
+
+## Build
+
+```console
+yarn build
+```
+
+This command generates static content into the `build` directory and can be served using any static contents hosting service.
+
+## Deployment
+
+```console
+GIT_USER=<Your GitHub username> USE_SSH=true yarn deploy
+```
+
+If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.

docs/babel.config.js

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+module.exports = {
+  presets: [require.resolve('@docusaurus/core/lib/babel/preset')],
+};

docs/blog/2019-05-28-hola.md

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+---
+slug: hola
+title: Hola
+author: Gao Wei
+author_title: Docusaurus Core Team
+author_url: https://github.com/wgao19
+author_image_url: https://avatars1.githubusercontent.com/u/2055384?v=4
+tags: [hola, docusaurus]
+---
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque elementum dignissim ultricies. Fusce rhoncus ipsum tempor eros aliquam consequat. Lorem ipsum dolor sit amet

docs/blog/2019-05-29-hello-world.md

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+---
+slug: hello-world
+title: Hello
+author: Endilie Yacop Sucipto
+author_title: Maintainer of Docusaurus
+author_url: https://github.com/endiliey
+author_image_url: https://avatars1.githubusercontent.com/u/17883920?s=460&v=4
+tags: [hello, docusaurus]
+---
+
+Welcome to this blog. This blog is created with [**Docusaurus 2 alpha**](https://v2.docusaurus.io/).
+
+<!--truncate-->
+
+This is a test post.
+
+A whole bunch of other information.

docs/blog/2019-05-30-welcome.md

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+---
+slug: welcome
+title: Welcome
+author: Yangshun Tay
+author_title: Front End Engineer @ Facebook
+author_url: https://github.com/yangshun
+author_image_url: https://avatars0.githubusercontent.com/u/1315101?s=400&v=4
+tags: [facebook, hello, docusaurus]
+---
+
+Blog features are powered by the blog plugin. Simply add files to the `blog` directory. It supports tags as well!
+
+Delete the whole directory if you don't want the blog features. As simple as that!

docs/docs/contributing.md

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+---
+id: contributing
+title: Contributing
+sidebar_label: contributing
+slug: /contributing
+---
+
+Test

docs/docs/installation.md

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+---
+id: other-page
+title: Other Page
+---
+
+This is a link to [another document.](overview.md) This is a link to an [external page.](http://www.example.com/)

docs/docs/markdown.md

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+---
+id: markdown
+title: Style Guide
+sidebar_label: Style Guide
+slug: /markdown
+---
+
+You can write content using [GitHub-flavored Markdown syntax](https://github.github.com/gfm/).
+
+## Markdown Syntax
+
+To serve as an example page when styling markdown based Docusaurus sites.
+
+## Headers
+
+# H1 - Create the best documentation
+
+## H2 - Create the best documentation
+
+### H3 - Create the best documentation
+
+#### H4 - Create the best documentation
+
+##### H5 - Create the best documentation
+
+###### H6 - Create the best documentation
+
+---
+
+## Emphasis
+
+Emphasis, aka italics, with *asterisks* or _underscores_.
+
+Strong emphasis, aka bold, with **asterisks** or __underscores__.
+
+Combined emphasis with **asterisks and _underscores_**.
+
+Strikethrough uses two tildes. ~~Scratch this.~~
+
+---
+
+## Lists
+
+1. First ordered list item
+1. Another item
+   - Unordered sub-list.
+1. Actual numbers don't matter, just that it's a number
+   1. Ordered sub-list
+1. And another item.
+
+* Unordered list can use asterisks
+
+- Or minuses
+
++ Or pluses
+
+---
+
+## Links
+
+[I'm an inline-style link](https://www.google.com/)
+
+[I'm an inline-style link with title](https://www.google.com/ "Google's Homepage")
+
+[I'm a reference-style link][arbitrary case-insensitive reference text]
+
+[You can use numbers for reference-style link definitions][1]
+
+Or leave it empty and use the [link text itself].
+
+URLs and URLs in angle brackets will automatically get turned into links. http://www.example.com/ or <http://www.example.com/> and sometimes example.com (but not on GitHub, for example).
+
+Some text to show that the reference links can follow later.
+
+[arbitrary case-insensitive reference text]: https://www.mozilla.org/
+[1]: http://slashdot.org/
+[link text itself]: http://www.reddit.com/
+
+---
+
+## Images
+
+Here's our logo (hover to see the title text):
+
+Inline-style: ![alt text](https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png 'Logo Title Text 1')
+
+Reference-style: ![alt text][logo]
+
+[logo]: https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png 'Logo Title Text 2'
+
+Images from any folder can be used by providing path to file. Path should be relative to markdown file.
+
+![img](../static/img/logo.svg)
+
+---
+
+## Code
+
+```javascript
+var s = 'JavaScript syntax highlighting';
+alert(s);
+```
+
+```python
+s = "Python syntax highlighting"
+print(s)
+```
+
+```
+No language indicated, so no syntax highlighting.
+But let's throw in a <b>tag</b>.
+```
+
+```js {2}
+function highlightMe() {
+  console.log('This line can be highlighted!');
+}
+```
+
+---
+
+## Tables
+
+Colons can be used to align columns.
+
+| Tables        |      Are      |   Cool |
+| ------------- | :-----------: | -----: |
+| col 3 is      | right-aligned | \$1600 |
+| col 2 is      |   centered    |   \$12 |
+| zebra stripes |   are neat    |    \$1 |
+
+There must be at least 3 dashes separating each header cell. The outer pipes (|) are optional, and you don't need to make the raw Markdown line up prettily. You can also use inline Markdown.
+
+| Markdown | Less      | Pretty     |
+| -------- | --------- | ---------- |
+| _Still_  | `renders` | **nicely** |
+| 1        | 2         | 3          |
+
+---
+
+## Blockquotes
+
+> Blockquotes are very handy in email to emulate reply text. This line is part of the same quote.
+
+Quote break.
+
+> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can _put_ **Markdown** into a blockquote.
+
+---
+
+## Inline HTML
+
+<dl>
+  <dt>Definition list</dt>
+  <dd>Is something people use sometimes.</dd>
+
+  <dt>Markdown in HTML</dt>
+  <dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
+</dl>
+
+---
+
+## Line Breaks
+
+Here's a line for us to start with.
+
+This line is separated from the one above by two newlines, so it will be a _separate paragraph_.
+
+This line is also a separate paragraph, but... This line is only separated by a single newline, so it's a separate line in the _same paragraph_.
+
+---
+
+## Admonitions
+
+:::note
+
+This is a note
+
+:::
+
+:::tip
+
+This is a tip
+
+:::
+
+:::important
+
+This is important
+
+:::
+
+:::caution
+
+This is a caution
+
+:::
+
+:::warning
+
+This is a warning
+
+:::

docs/docs/mdx.md

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+---
+id: mdx
+title: Powered by MDX
+---
+
+You can write JSX and use React components within your Markdown thanks to [MDX](https://mdxjs.com/).
+
+export const Highlight = ({children, color}) => ( <span style={{
+      backgroundColor: color,
+      borderRadius: '2px',
+      color: '#fff',
+      padding: '0.2rem',
+    }}>{children}</span> );
+
+<Highlight color="#25c2a0">Docusaurus green</Highlight> and <Highlight color="#1877F2">Facebook blue</Highlight> are my favorite colors.
+
+I can write **Markdown** alongside my _JSX_!