Merge pull request #4 from TeachBooks/feat/recurse-submodules

Enable submodules

Author: Tom-van-Woudenberg

.github/workflows/deploy-book.yml

@@ -63,6 +63,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         ref: ${{ matrix.branch }}
+        submodules: 'true'
 
     - name: Cache page build
       id: cache-html