Updated Element Web 1.7.24.1 -> 1.7.25

use custom docker registry

Signed-off-by: Ahmad Haghighi <haghighi@fedoraproject.org>

Add sanity check for server architecture

Fix for"nginx and two other services boot loops" #966

Fix step 3 of Mjolnir instructions

fix nginx boot loop

This was causing a port conflict when `matrix_nginx_proxy_enabled: false`.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/983

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/868

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/868

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/868

.. and prevent variable name overlap with `matrix-postgres` for the
other variables as well.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/868

- Added a postgres-backup role

Allow special characters in Grafana password and upgrade Grafana

GoMatrixHosting v0.4.0 update

Couple of additional tweaks to the mjolnir docs

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/962

Add mjolnir

Add some advice about making Synapse faster

Upgrade synapse-simple-antispam (0.0.1 -> 0.0.3)

Upgrade Element (1.7.24 -> 1.7.24.1)

Also removes some duplicate table of contents entries in maintenance-synapse.md