Fixes #3656. Also adds a light grey bar when there are both 0 merged
prs/closed issues and 0 open prs/issues.

Signed-off-by: Lauris Bukšis-Haberkorns <lauris@nix.lv>

* refactor struct's time to remove unnecessary memory usage

* use AsTimePtr simple code

* fix tests

* fix time compare

* fix template on gpg

* use AddDuration instead of Add

* Add Activity page to repository

* Add request data for activity

* Add issue data for activity

* Add user unit right checks

* Add releases to activity

* Log repository unit loading error