refactor: remove guide route prefix (#11146)

* refactor: remove guide route prefix

* chore: implement backwards compat redirect

* Change guide redirect destination and permanence

Updated the redirect destination and permanence for the guide route.

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Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/guide/src/lib/source.ts

@@ -15,6 +15,6 @@ export const source = loader({
 
 		return undefined;
 	},
-	baseUrl: '/guide/',
+	baseUrl: '/',
 	source: docs.toFumadocsSource(),
 });