Typedoc

[benmccann]

Closes #3996

Preview: https://kit-svelte-dev-l413933f6-svelte.vercel.app/types

Things left to do:

• currently displaying only property names. need to display the types and jsdoc comments as well. it's a little tricky because the types can be complex. probably need a shared fragment or component to do this
• it would be nice to link to types that are from SvelteKit. maybe link to MDN as well. need to search through the json file to find which exist
• shouldn't check in the .json file. generate it at build time and .gitignore it
• there's a few things like type aliases, the location of the source file, etc. that i'm currently not displaying. we probably don't need to display a lot of these, but there might be a couple we'd want to add
• the docs don't link to this new page at all. perhaps it shouldn't even be a new page and should just be on the TypeScript page or something. I haven't thought about this yet
• the styles need to be cleaned up. I copied them from the faq page as a start, but there's probably a lot that can be removed or written without global
• typedoc is generating a good handful of errors when running it

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Latest commit: 5de4826

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[benmccann]

Closing in favor of #4011