Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3402

This also adds labels for Synapse. Support for other homeservers and
components will be added later.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2532

We don't need this anymore. No one should be using matrix-nginx-proxy
anymore.

Change documentation for host bind port when fronting traefik with another reverse proxy

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

Otherwise the public hookshot url will use http and not https

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

This warning was added because of:
https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2090

The problem has since been fixed by:
e9e84341a9

This current patch was provoked by:
https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2352

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2351

Related to e9e84341a9

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2090

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.

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

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2090

Fixing code block formatting

Adding a bit on how to bind the synapse ports if the webserver isn't in the same docker network, or on a different machine.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1484

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1393

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1393

The different configurations are now all lower case, for consistent
naming.

`matrix_nginx_proxy_ssl_config` is now called
`matrix_nginx_proxy_ssl_preset`. The different options for "modern",
"intermediate" and "old" are stored in the main.yml file, instead of
being hardcoded in the configuration files. This will improve the
maintainability of the code.

The "custom" preset was removed. Now if one of the variables is set, it
will use it instead of the preset. This will allow to mix and match more
easily, for example using all the intermediate options but only
supporting TLSv1.2. This will also provide better backward
compatibility.

The new variables created to the nginx reverse proxy are properly added
to the documentation.