Pull the documentation submodule before the build step

Author: dannycolin

.github/workflows/jekyll.yml

@@ -40,6 +40,9 @@ jobs:
           ruby-version: '3.2' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 1 # Increment this number if you need to re-download cached gems
+          # Pull the /docs folder
+          submodules: recursive
+          fetch-depth: 0
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5