* Use ActivityPub outbox for Mastodon (et al.) feed
closes#2754
* Better description for Mastodon bridge
I mean I could rename it to ActivityPub bridge if the maintainer so pleases
* [Mastodon] Please the lint
* [Mastodon] address feedback
* [Mastodon] fix link, address spelling case bug
* refactor
* [Mastodon] add username cache, fix try-catch, rename
* [Mastodon] shorten description to satisfy the lint
* [Mastodon] address feedback
* [Mastodon] support Secure Mode instances
* [Mastodon] add config documentation
* [Mastodon] update docs
Co-authored-by: Dag <me@dvikan.no>
