Add info on federation protocol.

content/docs/self-hosting/index.md

@@ -18,6 +18,8 @@ Now, create A records to your server's public IP with the hostnames you had fill
 
 Finally, run `docker-compose up -d` and you're done!
 
+Consider joining the federation protocol at https://github.com/TeamPiped/piped-federation#how-to-join
+
 ## Docker-Compose Nginx AIO script
 
 Note: This setup requires you to have your own reverse proxy in addition to the one provide, and requires you to configure TLS manually.
@@ -51,6 +53,8 @@ server {
 
 Finally, configure your TLS certificates if you need to!
 
+Consider joining the federation protocol at https://github.com/TeamPiped/piped-federation#how-to-join
+
 # Manually updating
 
 Run `docker run --rm -v /var/run/docker.sock:/var/run/docker.sock containrrr/watchtower --run-once piped-frontend piped-backend ytproxy varnish nginx caddy postgres watchtower`