fix: add more svelte.dev redirects

[benmccann]

continuing work on #540

It seems I duplicated some existing redirects, but I'm not sure which ones or where they live

https://svelte.dev/docs/svelte-easing already redirects, but https://svelte.dev/docs/typescript doesn't. Any idea where the first redirect lives?

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[Rich-Harris]

here

svelte.dev/apps/svelte.dev/src/routes/docs/[...path]/+layout.server.ts

Lines 11 to 18 in 4e429de

	if (!document) {
	// in many cases, https://svelte.dev/docs/foo is now https://svelte.dev/docs/svelte/foo
	if (docs.pages[`docs/svelte/${params.path}`]) {
	redirect(308, `/docs/svelte/${params.path}`);
	}
	error(404, 'Not found');
	}

[Rich-Harris]

(I don't understand why the second link isn't redirecting)

[Rich-Harris]

(it does redirect in dev)

[benmccann]

I don't know either. It looks like just that one and another one that are broken: https://svelte.dev/docs/basic-markup

I was going to say maybe just the reference docs work, but v4-migration-guide seems to work. It's really strange. I think I'll just move the layout redirects since they don't seem to be working

[benmccann]

Although I suppose leaving the layout redirect there doesn't hurt just in case there's something I overlooked

[Rich-Harris]

I think I understand what's happening — the redirects need to be prerendered, and the /docs/typescript page isn't but /docs/svelte-easing is. The real mystery is why some redirects are being prerendered