Share Lemmy links with Voyager links

To spread Voyager as much as possible links should have the option be shared via Voyager links.

Now that a few servers are hosting their own copies of Voyager (like Lemmy.world), they could even share the locally hosted version of Voyager to spread load more.

**Example:**

Regular link:
https://lemmy.world/post/1234334

Hosted Voyager link:
https://m.lemmy.world/posts/lemmy.world/c/memes@lemmy.ml/comments/1234334

Voyager hosted:
https://vger.app/posts/lemmy.world/c/memes@lemmy.ml/comments/1234334