Update 'README.md'

README.md

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-# Ansible scripts for our homeservers
+# Homeservers
+
+This repository contains Ansible scripts to setup our home servers.
+The `common` role executes some common OS tasks.
+The `docker` role installs Docker.
+The other roles are specifically for the various services we run.
+
+## Running services
+
+All services below are running under Docker, except NSD because I couldn't figure out how to enable IPv6 for it.
+
+- Authoritative DNS using [NSD](https://www.nlnetlabs.nl/projects/nsd/about/) (ns.pizzapim.nl)
+- Reverse proxy using [Traefik](https://doc.traefik.io/traefik/)
+- Git server using [Forgejo](https://forgejo.org/) ([git.pizzapim.nl](https://git.pizzapim.nl))
+- Static website using [Hugo](https://gohugo.io/) ([pizzapim.nl](https://pizzapim.nl))
+- File sychronisation using [Syncthing](https://syncthing.net/)
+- Microblogging server using [Mastodon](https://joinmastodon.org/) ([social.pizzapim.nl](https://social.pizzapim.nl))
+- Calendar and contact synchronisation using [Radicale](https://radicale.org/v3.html) ([dav.pizzapim.nl](https://dav.pizzapim.nl))
+- KMS server using [vlmcsd](https://github.com/Wind4/vlmcsd)
+
+## Possible future services
+
+- matrix
+- peertube?
+- jitsi
+
 ## TODO
 
 ### NSD
 
-- ZSK rollover.
+#### ZSK Rollover
-- I always resign the zone, even if nothing has changed.
+
-I could check whether the zone has changed or new keys were generated but that is kind of difficult.
+Could make automatic key rollovers with cron or some other tool.
+
+#### Idempotency
+
+Currently I always resign zones.
+But for idempotency I should probably only do it if the zone has changed or the keys have changed.
+
+### Backup
+
+Borg backup?
 
 ### Firewall
 
-Seems to be a little annoying with all the docker stuff
+A little more difficult because of docker networking but probably doable.
-
-### Matrix
-
-### Peertube?
-
-### Jitsi