Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1544

Signed-off-by: Aaron Raimist <aaron@raim.ist>

Enables optional access to Etherpad's web-UI. This is useful for
managing Etherpad plugins.

Among other things, plugins makes it easy to manage/delete pads if you
install the adminpads2 plugin.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1484

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1480

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1242

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1478

Playbook config copied from mautrix-facebook and altered accordingly.

Add a self-build option for the Dimension Dockerfile.
 - This helps further support arm64 hosts (i.e. A1.Flex w/Oracle)

* Update importing-postgres.md

Additional deatails, mostly on repeating import. Structure troubleshouting section.

* Update importing-postgres.md

removing -K

* Fix path typo

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

typos an suggestion to expand search/replace statement to not replace on wrong places.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1393

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1393

This change should make it more obvious which order the steps must be done

Also indicates that the Mautrix googlechat bridge is a replacement for hangouts.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1322

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1282

It's mostly due to Docker CE dropping its repositories (and support) for
Debian 9.
If one installs Docker manually (likely a package named `docker.io`), it
will likely still work.
In any case, Debian 9 is old and end-of-life now, so advertising support
for it is not productive.