Update to use Docker Hub registry

- Change from Quay.io to Docker Hub (andersonid/openshift-resource-governance)
- Update GitHub Actions to use DOCKERHUB_USERNAME and DOCKERHUB_TOKEN
- Update all scripts and documentation to use Docker Hub
- Add DOCKERHUB-SETUP.md with detailed setup instructions
- Update Makefile, deploy scripts, and templates
- Simplify registry references (no quay.io prefix needed)

.github/workflows/openshift-deploy.yml

@@ -9,7 +9,7 @@ on:
 
 env:
   IMAGE_NAME: resource-governance
-  REGISTRY: quay.io/andersonid
+  REGISTRY: andersonid
   NAMESPACE: resource-governance
 
 jobs:
@@ -37,12 +37,11 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
       
-    - name: Login to Quay.io
+    - name: Login to Docker Hub
       uses: docker/login-action@v3
       with:
-        registry: quay.io
-        username: ${{ secrets.QUAY_USERNAME }}
-        password: ${{ secrets.QUAY_PASSWORD }}
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
         
     - name: Extract metadata
       id: meta