Add rageshake server

BuildX is required for building this container image.

There are no arm64 images published.. yet

This makes it consistent with the rest of the playbook:
- there's a default config which has various variables controlling
  settings
- there's also an `_extension_yaml` variable, which lets you override it

We disable it via `group_vars/matrix_servers`, as we do for all other
roles.

Update configuring-playbook-own-webserver.md

own traefik server option must have the path to the acme.json. Otherwise the service will not start.

The next task asks for a daemon reload, so there's no need to do it
twice.

Larger deployments may wish to run migration more often.

Allow configure default country code in element welcome page.

Update borgmatic 1.7.6 -> 1.7.7

Update Draupnir from v1.80.0 to v1.80.1

Added matrix_nginx_proxy_https_enabled to the own-nginx documentation

`always` is an nginx suffix, which shouldn't have been added to these.

Add `matrix_playbook_ssl_enabled: true` to configuring-playbook-own-webserver.md

Otherwise the public hookshot url will use http and not https

Continuation of 6cda711

Update ntfy v2.0.0-1 -> v2.0.1-0

remove comment regarding nginx in traefik doc