cleaning subtrees without wiping out the entire sprint folder

Author: doublebyte1

.github/workflows/main.yml

@@ -54,10 +54,11 @@ jobs:
 
       - name: Clean subtrees
         run: |
-          rm -rf sprints/15 &&  rm -rf sprints/16 && rm -rf sprints/17 &&
-          rm -rf sprints/nodes
-          || echo "Cleaning subtrees"
-
+          rm -rf sprints/15 
+          rm -rf sprints/16
+          rm -rf sprints/17
+          rm -rf sprints/nodes || echo "Cleaning subtrees"
+          
       - name: Add subtree 15
         run: |
           git subtree add --prefix sprints/15 https://github.com/opengeospatial/dev-ogc-org-sprint-landing-15.git gh-pages --squash || echo "Adding sprints/15"