documentation website setup

[fuxingloh]

What kind of PR is this?:

/kind docs

What this PR does / why we need it:

Implements a documentation static website for jellyfish alongside the code. Currently, there are 3 main section of documentation. I used https://v2.docusaurus.io/ a static website generator powered by react + markdown. As markdown is how the content get created, the ssg used is quite a trival decision.

1. Introduction - describing the project core.
2. Testcontainers - what is testcontainers and how to use it for your project.
3. Jellyfish - what is jellyfish and all the methods available

The docs structure:

docs/
├── jellyfish/
│   ├── api/
│   │   ├── mining.md
│   │   └── wallet.md
│   ├── overview.md
│   ├── design.md
│   └── usage.md
├── testcontainers/
│   ├── overview.md
│   └── usage.md
└── introduction.md

Which issue(s) does this PR fixes?:

Fixes #20

Additional comments?:

2 issues are created/separated to track the progress of website:

1. documentation front matter #62 for the front matter improvement of the docs website
2. documentation website continuous deployment #63 for CI/CD workflow of the website

This is how it looks like now for preview since, I have not created the workflow for automatic preview builds.

Light Mode	Dark Mode

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/jellyfish/dist/jellyfish.umd.js	15.66 KB (0%)	314 ms (0%)	150 ms (+1.72% 🔺)	463 ms

[codecov]

Codecov Report

Merging #64 (7f09b36) into main (89099f0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #64   +/-   ##
=======================================
  Coverage   93.85%   93.85%           
=======================================
  Files          14       14           
  Lines         244      244           
  Branches       29       29           
=======================================
  Hits          229      229           
  Misses         14       14           
  Partials        1        1           

Impacted Files	Coverage Δ
packages/jellyfish-core/src/category/wallet.ts	100.00% <ø> (ø)

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