[Don't Merge] Changes to migrate from Docusaurus v1 -> v2 to create internal docs

[jlin27]

Please don't merge this PR yet. Still troubleshooting changes.

• delete website/siteConfig.js
• create website/docusaurus.config.js
• create website/src/css/custom.css
• update .gitignore
• update website/package.json

[mannatsingh]

Hi @jlin27 thanks for working on this! I can import this if you're ready for a review :)

[jlin27]

Hi @mannatsingh - Will ping you when it's ready for a review! Still trouble-shooting some build issues and will need to finish up the internal docs portion of this PR. Just set this up for the docusaurus team to more easily review. Thanks!

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