docs: move 'What can I make with SvelteKit' back to FAQ

[theetrain]

This PR places 'What can I make with SvelteKit' content back to the FAQ, originally added in #10380.

I didn't realize this earlier, but it turns out "What can I make with SvelteKit" was moved to its own page during the new site migration: https://kit.svelte.dev/docs/what-can-i-make-with-sveltekit.

If you'd like to keep it that way, then you can disregard this PR.

I have some other drive-by fixes:

• Any FAQ links meant to go to the new /docs/integrations page now do
• Any links going to /faq now correctly go to /docs/faq

Another issue I found, but unsure how to fix:

• The Cloudflare Workers page links to ./faq#how-do-i-use-a-client-side-only-library-that-depends-on-document-or-window, but that heading's slug gets generated as how-do-i-use-x-with-sveltekit-how-do-i-use-a-client-side-only-library-that-depends-on-document-or-window — since it's a level-3 heading, it somehow merges with its respective level-2 heading's slug. I'm not sure if the generated slug is intentionally merged with its upper header, but I adjusted the link to satisfy the build for now.

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[ghostdevv]

The Cloudflare Workers page links to ./faq#how-do-i-use-a-client-side-only-library-that-depends-on-document-or-window, but that heading's slug gets generated as how-do-i-use-x-with-sveltekit-how-do-i-use-a-client-side-only-library-that-depends-on-document-or-window — since it's a level-3 heading, it somehow merges with its respective level-2 heading's slug. I'm not sure if the generated slug is intentionally merged with its upper header, but I adjusted the link to satisfy the build for now.

is that deliberate @PuruVJ ? regardless will merge for now 🙏