#Mitra v4.11.0

https://codeberg.org/silverpill/mitra/releases/tag/v4.11.0
https://codeberg.org/silverpill/mitra-web/releases/tag/v4.11.0

- Added FEP-ae97 gateway metadata endpoint and endpoint for deleting media.
- Set discoverable flag to true on actors. This doesn't affect Mitra servers, but some other applications treat actors without discoverable flag as non-discoverable and that led to unexpected behavior.
- The subscription page is updated immediately when remote server receives payment. Under the hood, an Update(Agreement) activity is being sent.