This needs to be added for WebSocket upgrades to work properly (see doc:
http://nginx.org/en/docs/http/websocket.html)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/795
and https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/822

A better fix will come later: https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/825

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/824

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/823

small fix to CHANGELOG.md

propose explicit showing single quotes around the password, since I forgot to put them there.

Some people run Coturn or Jitsi, etc., by themselves and disable it
in the playbook.

Because the playbook is trying to be nice and clean up after itself,
it was deleting these Docker images.

However, people wish to pull and use them separately and would rather
they don't get deleted.

We could make this configurable for the sake of this special case, but
it's simpler to just avoid deleting these images.
It's not like this "cleaning things up" thing works anyway.
As time goes on, the playbook gets updated with newer image tags
and we leave so many images behind. If one doesn't run
`docker system prune -a` manually once in a while, they'd get swamped
with images anyway. Whether we leave a few images behind due to the lack
of this cleanup now is pretty much irrelevant.

Fixes a regression introduced in 95346f3117.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/814

Using `matrix_synapse_` variables in the `matrix-postgres` role is not
ideal, but.. this script belongs neither here, nor there.
We'll have it be like that for now.

Fixed typo

Selfbuild appservice-irc bridge

The git module will create it anyway, but that would likely use `root:root`.

I got at least a few reports of people pasting these statements one by
one and missing the `;`.

We log everything in systemd/journald for every service already,
so there's no need for double-logging, bridges rotating log files
manually and other such nonsense.

Well, they still do go to that DB by default,
but our docs give a better command to users, which would do the right
thing.

This fixes things to make them compatible
with the changes done in 95346f3117

Fix typos

In short, this makes Synapse a 2nd class citizen,
preparing for a future where it's just one-of-many homeserver software
options.

We also no longer have a default Postgres superuser password,
which improves security.

The changelog explains more as to why this was done
and how to proceed from here.

Prompted by this: https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/779#issuecomment-764807507

Update element-web (1.7.16 -> 1.7.17)

I had intentionally held it back in 39ea3496a4
until:
- it received more testing (there were a few bugs during the
migration, but now it seems OK)
- this migration guide was written