Add community modules for Prosody and give an example of enabling notifications.

Config/Prosody/Dockerfile

@@ -8,7 +8,7 @@ FROM debian:trixie-slim
 ## Setup ##
 # System Dependencies
 RUN apt-get update && \
-		apt-get install -y prosody \
+		apt-get install -y prosody prosody-modules \
 								bash sudo htop \
 								vim