fix: wrong npx command for the local backend (#7)

Author: qbeauperin

src/admin/config.yml

@@ -8,7 +8,7 @@ backend:
 media_folder: "src/static/img"
 public_folder: "/static/img"
 
-# Please run "npx static-cms-proxy-server" for local backend
+# Please run "npx @staticcms/proxy-server" for local backend
 local_backend: true
 # publish_mode: editorial_workflow
 collections: