Migrate documentation to Docusaurus v2

[teikjun]

Summary

Hi there! As discussed in #669, we would like to migrate Litho's documentation website to Docusaurus 2.

Docusaurus 2 brings about many improvements:

• Client-side rendering with prerendering (site renders without JavaScript!)
• Embeddable interactive React components within markdown via MDX
• Docusaurus sites are React apps built with modern Javascript ecosystem tooling

In this PR, we've migrated the documentation over to Docusaurus 2 (in /website directory) while leaving the /docs directory intact.
We've matched the design of the original site as much as possible, so that the transition will be smooth for users of Litho.

Changelog

Migrate documentation website from Jekyll to Docusaurus v2

Test Plan

The test site is up! https://litho-deploy.vercel.app

@Drewbi and I are looking to improve the documentation site further based on your feedback.
Please let us know what you think! :)

cc @yangshun

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[colriot]

I've noticed that Litho version is not pulled in correctly, like:

implementation 'com.facebook.litho:litho-core:{{site.litho-version}}'
implementation 'com.facebook.litho:litho-widget:{{site.litho-version}}'

{site.litho-version} was a part of the website config before, to be able to update it in one place during the release

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[teikjun]

I've noticed that Litho version is not pulled in correctly, like:

implementation 'com.facebook.litho:litho-core:{{site.litho-version}}'
implementation 'com.facebook.litho:litho-widget:{{site.litho-version}}'

{site.litho-version} was a part of the website config before, to be able to update it in one place during the release

We've just fixed this issue!
As before, the versions can be updated in one place versionConfig.js (found in the website's root directory).
The updated version will be reflected across all docs! :)

[facebook-github-bot]

@teikjun has updated the pull request. Re-import the pull request

[JoelMarcey]

How are we on this? Are we good to go with the migration?

[Drewbi]

Should be all complete unless there’s any changes you can think of.

[facebook-github-bot]

@astreet has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[muraziz]

I fixed internal errors, we should be ready for migration. @JoelMarcey could you advice on how to migrate, I pinged you on the phabricator diff

[muraziz]

Commit is merged, now we should be able to redirect website to new one. Will update here when it happens.

[facebook-github-bot]

@muraziz merged this pull request in 727b801.

[colriot]

@Drewbi @teikjun just for your info: we didn't just shelve your effort, we are currently working on integrating this into our internal docs publishing mechanism (this won't be Github Pages eventually, so we don't waste time on making Docusaurus work with them)