Add an `id desc nulls last` index to notifications

See merge request !975

fix up missing announcements with preloads

See merge request !972

add overriding truncated_namespace condition for truncating paths for digital ocean

See merge request !969

Serve non-public activities in /api/v1/favourites

Closes #648

See merge request !970

Fixes #648

mrf/keyword_policy.ex: Fix when summary == nil, do not whitelist content == nil

See merge request !968

Ignore compilation warnings for undefined module :eldap

See merge request !956

preloaded object normalization

See merge request !967

activity: use left join instead of inner join when fetching activities that may or may not have a child object

activitypub: allow skipping preload in some cases (like certain tests where the preload is obnoxious)