Remove CMS directory added by other AI and fix Docker registry in workflow

Author: GeiserX

.github/workflows/main.yml

@@ -9,8 +9,8 @@ on:
     branches: [ main, master, develop ]
 
 env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
+  REGISTRY: docker.io
+  IMAGE_NAME: ${{ secrets.DOCKER_USERNAME }}/website-diff
 
 jobs:
   test:
@@ -71,10 +71,10 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
 
-    - name: Log in to Container Registry
+    - name: Log in to Docker Hub
+      if: github.event_name != 'pull_request'
       uses: docker/login-action@v3
       with:
-        registry: ${{ env.REGISTRY }}
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_TOKEN }}