Port 80 for IPv6

Upgrade Heisenbridge (1.5.0 -> 1.6.0)

Related to c4d2c8394c

Official support ends today (2021-11-11).
Synapse still supports v9.6, but we'd better force users to transition
to newer versions anyway.

Nginx & Certbot Updates

Until now, we were leaving services "enabled"
(symlinks in /etc/systemd/system/multi-user.target.wants/).

We clean these up now. Broken symlinks may still exist in older
installations that enabled/disabled services. We're not taking care
to fix these up. It's just a cosmetic defect anyway.

Upgrade Element (v1.9.4)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1377

Regresion since https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1139

add server_name to matrix-synapse.conf only if matrix_nginx_proxy_enabled

Upgrade Heisenbridge (1.4.1 -> 1.5.0)

chore: adding some explanations about setting prometheus password

* fix for string concatenation on matrix_synapse_account_threepid_delegates_email and matrix_synapse_account_threepid_delegates_msisdn

* .editorconfig should not be ignored

* Restore .gitignore

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

change port 8090 to matrix_ma1sd_default_port

We were applying the low-memory system patch to webpack.config.js
on systems with < 4GB memory.

From now on, we also let people force-enable patching by toggling the
`matrix_client_element_container_image_self_build_low_memory_system_patch_enabled`
variable.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1357

Upgrade Heisenbridge (1.4.0 -> 1.4.1)

GoMatrixHosting v0.6.4

fixes #1365

docker-ce does not like quotes around the shm-size value

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1268

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1364

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1362

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1357

Should have been done in 63f5a88fa0.

Upgrade Heisenbridge (1.3.0 -> 1.4.0)

update IRC appservice

https://github.com/matrix-org/matrix-appservice-irc/releases/tag/0.32.1

caddy example fixes

- caddy v1 requires a path in the header directive
- msisd has been replaced in favour of ma1sd

Prometheus & Grafana Update

Upgrade Element (v1.9.3)