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

The newly extracted role also has native Traefik support,
so we no longer need to rely on `matrix-nginx-proxy` for
reverse-proxying to Ntfy.

The new role uses port `80` inside the container (not `8080`, like
before), because that's the default assumption of the officially
published container image. Using a custom port (like `8080`), means the
default healthcheck command (which hardcodes port `80`) doesn't work.
Instead of fiddling to override the healthcheck command, we've decided
to stick to the default port instead. This only affects the
inside-the-container port, not any external ports.

The new role also supports adding the network ranges of the container's
multiple additional networks as "exempt hosts". Previously, only one
network's address range was added to "exempt hosts".

Update ntfy 1.31.0 -> 2.0.0

Update mautrix-whatsapp 0.8.1 -> 0.8.2

Update mautrix-discord 0.1.0 -> 0.1.1

This also updates `docs/configuring-playbook-own-webserver.md`,
trying to make it up-to-date with all recent changes.

Update mautrix slack docs

Update ntfy 1.30.1 -> 1.31.0

Wiring happens via `group_vars/matrix_servers` now.

It's the same result as b6d45304b4b19, but it's done in a cleaner way.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2480

.. and try to auto-switch between `bind` and `volume` depending on
whether there's a slash in the `src` path.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2482

Added link to exim/email documentation

update postmoogle 0.9.13 -> 0.9.14

Related to 6a52be7987 and 28e7ef9c71f02

* make banlist consistent
* proper multi-error message
* ignore "." MX hosts
* try recipient domain directly, even when MX records found, but failed