Optimize SSL session

Add Heisenbridge

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1062

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1062

Fixed typos in README

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1057

Not sure if this is beneficial though.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1057

Enable OCSP Stapling

Updated Element version (1.7.27 -> 1.7.28)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1058

We may try to capture such calls and return a friendlier response (HTML
or JSON) saying "The Synapse Admin API is not enabled", but that may not
be desirable.

For now, we stick to what "upstream" recommends: "simply
don't proxy these APIs", which should lead to the same kind of 404 that
we have now.
See here: 6660912226/docs/reverse_proxy.md (synapse-administration-endpoints)

Update prometheus & grafana

Hi,
I used [LanguageTool](https://languagetool.org) to fix typos in README

Related to https://github.com/devture/exim-relay/pull/9

Added services built by community

Related to https://github.com/Awesome-Technologies/synapse-admin/issues/132

We should switch back when >0.8.0 gets released.

Hi,
After discussion with Slavi ([link to private chat](https://matrix.to/#/!GWNJzoHiCybWdouIiP:etke.cc/$_XpK8-ucbWvxY667IVZ9ROZPqSVkG2UGglNagrbDQmw?via=etke.cc&via=devture.com)), we agreed on adding services that use matrix-docker-ansible-deploy as a core to list in README file.

@GoMatrixHosting could you approve the description is correct, please? (Sorry, I just put what I know about your service)

Upgrade Synapse (1.33.1 -> 1.33.2)

This release fixes a denial of service attack (CVE-2021-29471) against Synapse's push rules implementation. Server admins are encouraged to upgrade.

Ref: https://github.com/matrix-org/synapse/releases/tag/v1.33.2

GoMatrixHosting v0.4.6

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1047

689dcea773 wasn't enough. The `upstream/..` tags are
just upstream sources, without the alpine-based Dockerfile.
We need to use the `docker/..` tags for that (or `master`)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1032

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1023

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1009

Related to https://github.com/devture/exim-relay/issues/6