Migrate docs to Nextra

[svix-lucho]

Get rid of Docusaurus, and replace it with Nextra.

This involved a lot of file moving and a search-and-replace in the MDX files.

The rest is just bringing in Nextra, cleaning up no longer used files, and adding some of the customizations we had in this new template, like the product switcher.

What I took into account:

• No route changes. I know that's hard to review in this PR, but as I was doing this I made sure all routes remained the same. The file hierarchy inside content is the same that what it was in docs, and the docusaurus redirections were converted to a nextjs redirect (see next.config.ts)
• Product switcher. Tried to mimic something similar to what we had. And I added Diom now that I'm here.
• Replaced docusaurus admonitions with nextra's Callout component
• Updated Code samples to use Nextra's component
• Replicated the sidebars (see old) and navbar using the _meta.tsx files
• Removed HeaderWithCopyButton - this functionality is built-in in Nextra now
• Update README
• Remove yarn, use npm
• Verified the page titles, social media banner and metadata works in the new version

Sorry for the big-ass PR. There's really no other way to do this. On the bright side, most of the LOC difference is from package-lock.json anyway, and the differences in mdx files are trivial to review side by side.

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Project	Deployment	Actions	Updated (UTC)
svix-docs	Ready	Preview, Comment	Apr 22, 2026 4:20pm