Log Message:
snac: update to 2.61. Changes:

Migration from a Mastodon account to a snac one has been implemented.
Please see `snac(8)` (the administrator manual) for more information.

Mastodon API: fixed `timelines/public` (it was showing less posts that
it should).

Fixed over-zealous caching to the public timeline.

Some HTML tweaks and fixes to the web interface.