updated migration notes

opsec/forgejo-anon/index.html

@@ -137,7 +137,10 @@ networks:
 
 services:
   server:
+    #image: gitea/gitea:latest 
+	# to migrate from an existing gitea instance to a forgejo one all you need is to simply comment this above line, and replace it with the one below:
     image: codeberg.org/forgejo/forgejo:9.0.3
+	# but warning, this won't work anymore starting from 1.23.X, 1.22.X is the last version where you can do this seamlessly.
     container_name: forgejo
     environment:
       - USER_UID=1000