Updated the GH Actions for RMG-Py to check if folder exists before cloning, and updated the GitHub Pages publish directory to point to ARC documentation.

Author: calvinp0

.github/workflows/cont_int.yml

@@ -57,10 +57,15 @@ jobs:
     - name: Clone & checkout RMG-Py at specific SHA
       if: steps.cache-rmg-py.outputs.cache-hit != 'true'
       run: |
-        git clone --filter=blob:none --no-checkout https://github.com/ReactionMechanismGenerator/RMG-Py.git RMG-Py
-        cd RMG-Py
-        git fetch --no-tags --prune origin ${RMG_PY_COMMIT}
-        git checkout --detach ${RMG_PY_COMMIT}
+        if [ -d RMG-Py/.git ]; then
+          echo "Updating cached RMG-Py…"
+          git -C RMG-Py fetch --depth=1 origin ${RMG_PY_COMMIT}
+          git -C RMG-Py checkout --force ${RMG_PY_COMMIT}
+        else
+          echo "Cloning RMG-Py…"
+          git clone --filter=blob:none --no-checkout https://github.com/ReactionMechanismGenerator/RMG-Py.git RMG-Py
+          git -C RMG-Py checkout --detach ${RMG_PY_COMMIT}
+        fi
 
     - name: Cache RMG-database
       id: cache-rmg-db