Restructuring docker (again)

- Nested structure to match /var/lib/mopidy
- Updating gitignore to exclude individual configs

docker/mopidy/mopidy.example.conf

@@ -0,0 +1,18 @@
+[core]
+data_dir = /var/lib/mopidy
+
+[audio]
+#output = tee name=t ! queue ! autoaudiosink t. ! queue ! udpsink host=0.0.0.0 port=5555
+output = audioresample ! audioconvert ! audio/x-raw,rate=48000,channels=2,format=S16LE ! wavenc ! filesink location=/tmp/snapfifo
+
+[http]
+hostname = 0.0.0.0
+default_app = iris
+
+[mpd]
+hostname = 0.0.0.0
+
+[spotify]
+# Fast startup because we use the Spotify HTTP API to load these instead
+# Makes playlists unavailable under Browse > Spotify.
+allow_playlists = false