fix: redirect learn.svelte.dev homepage for svelte.dev/tutorial (sveltejs#568)

closes sveltejs#564

Author: dummdidumm

apps/learn.svelte.dev/vercel.json

@@ -569,6 +569,10 @@
 			"source": "/tutorial/next-steps",
 			"destination": "https://svelte.dev/tutorial/kit/next-steps"
 		},
+		{
+			"source": "/",
+			"destination": "https://svelte.dev/tutorial"
+		},
 		{
 			"source": "/(.*)",
 			"destination": "https://svelte.dev/$1"