Selfbuild appservice-slack bridge

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/793

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/786

Local rebuild for Telegram

Before we potentially clone to that path, we'd better make sure it exists.

We also simplify `when` statements a bit.
Given that we're in `setup_install.yml`, we know that the bridge is enabled,
so there's no need to check for that.

This is a bit misleading, because the old Docker image
was tagged as `4.93.1`. There hasn't been a `4.93.1` version yet though.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/792

Related to d5945c6e78

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/778

Call API list tokens enpoint

Closes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/755

Not sure if it breaks with them or not, but no other directive
uses quotes and the nginx docs show examples without quotes,
so we're being consistent with all of that.

Code was clean up and simplified to make it simpler and easier to
maintain. No features were modified.

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.

Fix appservice-slack default db: nedb

That bridge only supports its own file-based database,
so preparing a Postgres database for it is pointless.

Fixup for https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/769

Related to 6e652e10ad

Drop the old workaround for an Ansible bug that has been fixed three years ago

Provoked by https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/743

Added a role for the bridge mautrix-signal

We try to only use console logging (going to journald) for everything,
instead of logging things twice (or more).