release: stable-5870

* d9b84cfc jibri: set base URL for joining meetings
* a77a43e3 jibri: update default Chrome version to 90
* a90e4ce5 doc: drop confusing port number from PUBLIC_URL
* 8620caad doc: clarify env variable
* 6f52f71b web: add FLoC environment variable
* 014aa59d web: add default language variable
* ce25bf67 doc: update CHANGELOG
* 6bf13364 misc: working on latest