Bump version of mautrix-telegram to 0.8.2

fixes matrix users unable to delete messages

Added config sample for synapse admin with traefik 2

Update configuring-playbook-ma1sd.md

Add an example to open all domains for registration in relation to black- and whitelists.

Fix regression since 2a50b8b6bb (#597).

Dimension is intended to be embedded in various clients,
be it the Element service that we host (at element.DOMAIN),
some other Element (element-desktop running locally), etc.

Changelog here https://github.com/jitsi/jitsi-meet/releases/tag/stable%2Fjitsi-meet_4857

Nginx proxy headers

Fix capability names for synapse-admin

Fixes #562 (Github Issue)

Fixes #595 (Github Issue)

Update configuring-dns.md

Adding a comment with regard to DNS propagation

Added gpg as base dependency for Debian 10

AWS Debian marketplace image does not have gpg preinstalled

https://aws.amazon.com/marketplace/pp/B0859NK4HC?ref=cns_srchrow

TASK [matrix-base : Ensure Docker's APT key is trusted] *******************************************************************************************************************************************************
fatal: [matrix.domain.com]: FAILED! => {"changed": false, "msg": "Failed to find required executable gpg in paths: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}

Closes #590

Fix issues building ma1sd Docker image

The when statement is supposed to be on the block, not on the individual task.

It affects all tasks within the block (they're all to be executed when ma1sd is enabled and self-building is requested0.

Fixes #586 (Github Issue)

The tag format used in the `ma1sd` repo have change. Versions no longer
start with 'v', and when building for non-amd64, we also need to strip
off the '-$arch' bit from the Docker image name.

Further, when building the .jar file, `ma1sd` currently names the .jar
based on the project's directory, which we call 'docker-src'. This means
other parts of the `ma1sd` build can't find the .jar file. Remedy this
by ensuring that the dir is called `docker-src/ma1sd`.

Update nginx (1.19.0 -> 1.19.1) and certbot (1.5.0 -> 1.6.0)

Update README.md to rename Riot into Element

Related to #583 (Github Issue).