Create community redirects

[avidseeker]

• [x] Did you check to see if this issue already exists?
• [x] Is this only a single feature request? Do not put multiple feature requests in one issue.
• [x] Is this a question or discussion? Don't use this, use https://lemmy.ml/c/lemmy_support.
• [x] Is this a UI / front end issue? Use the lemmy-ui repo.

Add the ability for servers to set up redirects to other instance communities. E.g: Say lemmy.world instance doesn't want to have a lemmy_support community. It can instead create a link redirect from https://lemmy.world/c/lemmy_support to https://lemmy.ml/lemmy_support.

This can help reduce duplicated server entries IF a server instance is willing to.

[th0mcat]

This is exactly what Element does for Matrix rooms, and it would be a huge quality of life update for anyone searching for a specific community on Lemmy/kbin.

To provide a real life example, I have my Matrix server at #cybersecurity:thomcat.rocks set as a local address for #cybersecurity:matrix.org. This is listed in the room settings on #cybersecurity:matrix.org.

[lionirdeadman]

Related to https://github.com/LemmyNet/lemmy/issues/3057

[dessalines]

This wouldn't be too difficult to implement, would be a good first issue.