Add ability to block instance from community and profile pages, as well as comments.

[dessalines]

Pre-Flight checklist

• Did you check to see if this issue already exists?
• This is a single feature request. (Do not put multiple feature requests in one issue)
• This is not a question or discussion. (Use https://lemmy.ml/c/jerboa for that)

Describe The Feature Request Below

This functionality already exists on posts as an additional popup, but it should also be added to comments, and the community and profile pages.

Context: #1279