Update Mjolnir from 1.3.2 to 1.4.1

`roles/matrix-synapse/vars/workers.yml` has not been updated here,
because running `roles/matrix-synapse/files/workers-doc-to-yaml.awk`
seems to cause some trouble with the current `workers.md` file
available at https://github.com/matrix-org/synapse/raw/master/docs/workers.md,
namely lots of:

> FIXME: ADDITIONAL CONDITIONS REQUIRED: to be enabled manually

lines and commented out regex lines.

This is something that remains to be investigated/fixed.

Update mautrix-whatsapp 0.2.4 -> 0.3.0

add detailed docs about hookshot's URLs

Don't recommend that the Dimension admin interface be opened in a web browser

Fix index in external_prometheus.yml.example.j2

Update IRC appservice bridge

For an unknown reason prometheus ignored the given "numeric" index and replaced it by 1. This made it not work properly, plus multiple workers of same types were not differentiable. With a "string" index, it works as intended.

As mentioned in the changelog, this is a breaking change.

Update Cinny 1.8.1 -> 1.8.2

fix: avoid yaml being wrapped at column 80 via to_nice_yaml

Add check for ma1sd repo changes on image self build

The `to_nice_yaml` helper will by default wrap any string YAML values on
the first space after column 80. This can in worst case yield invalid
YAML syntax. More details in Ansible's documentation here:

https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#formatting-data-yaml-and-json

In short, you need to explicitly provide a custom width argument of a
high number of some kind to avoid the line wrapping.

Adding when clause to ma1sd image build task to avoid image being built if not needed.

Update Cinny 1.8.0 -> 1.8.1

Update Element 1.10.6 -> 1.10.7

add default for matrix_prometheus_scraper_hookshot_enabled

bridge-mautrix-facebook: add support for web-based login

mautrix-facebook, synapse: minor improvements

matrix_synapse_federation_port_enabled can be disabled by users, for
example, when one wants to use the same port for client and federation
requests (docs/configuring-playbook-federation.md).

https://github.com/mautrix/facebook/issues/215

beeing a bit more specific how to access the dimension admin interface

`matrix_nginx_proxy_enabled` is usually set to false by users, this is when
the warning should be displayed.

Fixup for d8a19e5bf9

Building mx-puppet-discord appears to have been broken for a while.

Related to:
- https://github.com/matrix-discord/mx-puppet-discord/issues/201
- https://github.com/matrix-discord/mx-puppet-discord/issues/202
- https://github.com/matrix-discord/mx-puppet-discord/issues/203

We'd rather use a fork that is maintained better and by someone who
cares about whether their software works or not, so we'll be using the
Beeper-maintained for from now on.

In the future, we should probably do the same for the Slack bridge
which is also part of the same monorepo
(https://gitlab.com/beeper/mx-puppet-monorepo).

Various roles depend on this. It makes sense to make it part
of the `matrix-base` role.

client-cinny: update to v1.8.0

Riot is now named Element

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1682
- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1679

"Federate rooms" switch for mautrix bridges