docs: fix read-only-auth example

fixes #175

examples/read-only-auth/README.md

@@ -1,6 +1,6 @@
 # Docker registry with read only access
 
-This is the configuration for a docker registry UI using `REGISTRY_URL` (as a proxy) with read only access to the registry.
+This example will override the original nginx conf with read only access to the registry. You will need to rewrite all the project configuration (replaces `proxy_pass` with your own value, in this example `http://registry:5000` is fine).
 
 There are two htpasswd files. `read-write.htpasswd` a read and write access to the registry and `read-only.htpasswd` for a read only access.
 

examples/read-only-auth/docker-compose.yml

@@ -14,7 +14,6 @@ services:
       - 80:80
     environment:
       - REGISTRY_TITLE=My Private Docker Registry
-      - REGISTRY_URL=http://registry:5000
     volumes:
       - ./nginx.conf:/etc/nginx/conf.d/default.conf
       - ./read-write.htpasswd:/etc/nginx/auth/read-write.htpasswd:ro