Log Message:
snac: update to 2.70. Changes:

Notifications are now shown in a more compact way (i.e. all reactions
are shown just above your post, instead of repeating the post *ad
nauseam* for every reaction).

New command-line option `unmute` to, well, no-longer-mute an actor.

The private timeline now includes an approximate mark between new posts
and "already seen" ones.

Fixed a spurious 404 error in the instance root URL for some
configurations.