The playbook tries to avoid such variables which are sometimes defined
and sometimes not. We'd rather not check for `is defined`.

None of the other roles use handlers.

We rely on com.devture.ansible.role.systemd_service_manager to reload services when it's necessary to do so.

Check for empty string instead of Null to verify if an openid_server_name is pinned.

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

This extends the collection with support for seamless authentication at the Jitsi server using Matrix OpenID.

1. New role for installing the [Matrix User Verification Service](https://github.com/matrix-org/matrix-user-verification-service)
2. Changes to Jitsi role: Installing Jitsi Prosody Mods and configuring Jitsi Auth
3. Changes to Jitsi and nginx-proxy roles: Serving .well-known/element/jitsi from jitsi.DOMAIN
4. We updated the Jitsi documentation on authentication and added documentation for the user verification service.