fix: remove link for removed page (#315)

Author: tomoam

content/tutorial/01-svelte/08-stores/02-auto-subscriptions/README.md

@@ -15,7 +15,7 @@ Start by declaring `unsubscribe` in `App.svelte`:
 
 > Calling a `subscribe` method returns an `unsubscribe` function.
 
-You now declared `unsubscribe`, but it still needs to be called, for example through the `onDestroy` [lifecycle hook](/tutorial/ondestroy):
+You now declared `unsubscribe`, but it still needs to be called, for example through the `onDestroy` lifecycle hook:
 
 ```svelte
 /// file: App.svelte