fix: fetch all submodules

Author: okwasniewski

.github/workflows/deploy-docs.yml

@@ -14,6 +14,7 @@ jobs:
       uses: actions/checkout@v3
       with:
         fetch-depth: 0
+        submodules: 'recursive'  # Fetches all submodules recursively
 
     - name: Install Doxygen
       run: |