Update docs and changelog

CHANGELOG.md

@@ -1,3 +1,12 @@
+# 2021-01-31
+
+## Etherpad support
+
+Thanks to [@pushytoxin](https://github.com/pushytoxin), the playbook can now install the [Etherpad](https://etherpad.org) realtime collaborative text editor. It can be used in a [Jitsi](https://jitsi.org/) audio/video call or integrated as a widget into Matrix chat rooms via the [Dimension](https://dimension.t2bot.io) integration manager.
+
+To get it installed, follow [our Etherpad docs page](docs/configuring-playbook-etherpad.md).
+
+
 # 2021-01-22
 
 ## (Breaking Change) Postgres changes that require manual intervention

docs/configuring-playbook-etherpad.md

@@ -2,13 +2,13 @@
 
 [Etherpad](https://etherpad.org) is is an open source collaborative text editor that can be embedded in a Matrix chat room using the [Dimension integrations manager](https://dimension.t2bot.io)
 
-When enabled together with Jitsi, it will be made available as an option during the conferences.
+When enabled together with the Jitsi audio/video conferencing system (see [our docs on Jitsi](configuring-playbook-jitsi.md)), it will be made available as an option during the conferences.
 
 ## Prerequisites
 
 For the self-hosted Etherpad instance to be available to your users, you must first enable and configure the **Dimension integrations manager** as described in [the playbook documentation](configuring-playbook-dimension.md)
 
-## Enable
+## Installing
 
 [Etherpad](https://etherpad.org) installation is disabled by default. You can enable it in your configuration file (`inventory/host_vars/matrix.<your-domain>/vars.yml`):
 

docs/container-images.md

@@ -32,6 +32,8 @@ These services are not part of our default installation, but can be enabled by [
 
 - [ewoutp/goofys](https://hub.docker.com/r/ewoutp/goofys/) - the [Goofys](https://github.com/kahing/goofys) Amazon [S3](https://aws.amazon.com/s3/) file-system-mounting program (optional)
 
+- [etherpad/etherpad](https://hub.docker.com/r/etherpad/etherpad/) - the [Etherpad](https://etherpad.org) realtime collaborative text editor that can be used in a Jitsi audio/video call or integrated as a widget into Matrix chat rooms via the Dimension integration manager (optional)
+
 - [devture/email2matrix](https://hub.docker.com/r/devture/email2matrix/) - the [Email2Matrix](https://github.com/devture/email2matrix) email server, which can relay email messages to Matrix rooms (optional)
 
 - [devture/matrix-corporal](https://hub.docker.com/r/devture/matrix-corporal/) - [Matrix Corporal](https://github.com/devture/matrix-corporal): reconciliator and gateway for a managed Matrix server (optional)