docs(v2): Refactor + Articles Infra

[eranhirsch]

Adding a heading section to the v1 docs that would provide general context for the v2 migration

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[eranhirsch]

This is a huge PR, I played around a lot with astro to try and see how we can make it the easiest to add content to the site, and re-use as much as possible now that V1 is going to be part of the site for a while.

The main things in this PR are:

• Adding the ability to render content as part of the docs pages
• Normalizing the usage of shadcn, removing any manual changes done previously in favour of simpler modifications "from the outside".
• Creating a version selector in the navbar instead of 2 entries in the top bar.

[TkDodo]

🎉 This PR is included in version 2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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