Implement MSC1929

[Salamandar]

See https://matrix.org/blog/2023/10/20/this-week-in-matrix-2023-10-20/

Recently, we introduced MSC1929 integration into Matrix Rooms Search. This feature automatically notifies server owners by email if a room on their server is reported for any issues. It's an important step toward enhancing safety within the Matrix Federation.

However, we've noticed that the adoption of MSC1929 across Matrix servers is relatively low, despite the fact it is going to the proposed Final Comment Period soon. This is where we need your help!

On behalf of the MRS project, we're reaching out to you to add (or update, if you previously configured it) MSC1929 support to your homeserver. Together, we can make the Matrix Federation a safer and more secure environment for everyone.

So, how can you do this? It's simple! You just need to serve the /.well-known/matrix/support file with the following structure on your homeserver's domain. If your Matrix ID is @you:example.com, the file should be available at https://example.com/.well-known/matrix/support:

{
  "contacts": [
    {
      "email_address": "your@email.here",
      "matrix_id": "@your:mxid.here",
      "role": "admin"
    }
  ]
}

[Josue-T]

Closing as duplicate of #421