feat: Adds example in Caddyfile of reverse proxy on same host as caddy.

caddy/config/Caddyfile

@@ -11,10 +11,18 @@
     resolvers 1.1.1.1
   }
 
-  # example of reverse proxy.
+  # Example of reverse proxy on a separate host.
 
   @gitea host git.housh.dev
   handle @gitea {
     reverse_proxy 192.168.10.76:3000
   }
+
+  # Example of revers proxy on same host
+  # This assumes the container name is gitea.
+
+  @gitea host git.housh.dev
+  handle @gitea {
+    reverse_proxy gitea:3000 # uses the container name for DNS discovery.
+  }
 }