Docs: Add get started index page

[kylegach]

Note for reviewers:
There are currently issues displaying the images in the Gatsby site. While I work on those, the content can be reviewed, and you can see the intended design in the screenshot below.

What I did

Add a page at the docs/get-started/ route, which previously redirected to /docs/get-started/install. Frontpage will be updated to redirect /docs to this page instead of the install page.

Checklist for Contributors

Testing

Manual testing

1. Follow the steps in the contributing instructions for this branch, kylegach/sbdx-167-build-out-docs-homepage

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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[JReinhold]

Based on the screenshot it looks like the vertical spacing between these cards (between row 1 and row 2) is inconsistent with the spacing between all the other cards.

[cdedreuille]

Thanks @kylegach and @JReinhold. This is now all fixed. Appart from the icons not showing up, this is how it look:

• New design for frameworks
• Responsive blocks to work on mobile & tablets
• Improved spacing across the page
• Moved the text (+remove the framework intro) below the list of frameworks. This is a proposition but it felt way cleaner to have the list of frameworks directly underneath the install block without any interruption. I think this is enough self explanatory to not have to intro the list.

[cdedreuille]

Looks good to me!