Make default server name more obvious

Too many people fell into the trap and left conduit.rs in the deployment
configuration, wondering why users are all listed as @conduit.rs.

Make the default server name really easy to identify and make it obvious
that this needs to be changed.

DEPLOY_FROM_SOURCE.md

@@ -23,7 +23,7 @@ ## Setup systemd service
 After=network.target
 
 [Service]
-Environment="ROCKET_SERVER_NAME=conduit.rs" # EDIT THIS
+Environment="ROCKET_SERVER_NAME=YOURSERVERNAME.HERE" # EDIT THIS
 
 Environment="ROCKET_PORT=14004" # Reverse proxy port