This PR changes the screenshots in the Blocking users page. It not only updates the block user dialog shown in the page (since it has been [changed](/forgejo/forgejo/pulls/4204) to have better wording and explanation), but it also changes the other screenshots to be consistent with the rest of the page, oh and they used (old?) Gitea theme, not Forgejo)
Reviewed-on: https://codeberg.org/forgejo/docs/pulls/741
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Ikuyo Kita <kitakita@disroot.org>
Co-committed-by: Ikuyo Kita <kitakita@disroot.org>
- Update images to the 'new' design and have better consistency with
sizes (using Firefox's screenshot node feature).
- Add section for blocking users as a user of where to find the list of
blocked users and how to unblock them.
