Also:

- Fix Mastodon logo not showing up in status embeds
- Fix blurhash not being used in status embeds
- Fix blurhash not being used in admin UI
- Fix autoplay param not working correctly on status embeds

Fix #10930

* Add voters count to polls

* Add ActivityPub serialization and parsing of voters count

* Add support for voters count in WebUI

* Move incrementation of voters count out of redis lock

* Reword “voters” to “people”

* Add own_votes field to poll results in REST API

Fixes #10679

* Display user votes in WebUI

* Update styling

* Add vote checkmark to public pages