Add workflow for github pages (API documentation).

.github/workflows/api-docs.yml

@@ -1,44 +1,48 @@
-name: CMake
+name: API Documentation
 
 on: [push, workflow_dispatch]
 
-env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-
 jobs:
-  build:
+  deploy:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-
-    - name: Install Dependencies
-      run: |
-        sudo apt-get install python3-Sphinx python3-sphinx-bootstrap-theme python3-breathe
-        pip install sphinx_rtd_theme
-
-    - name: Create Build Environment
-      run: cmake -E make_directory build
-
-    - name: Configure CMake
-      # Use a bash shell, so we can use the same syntax for environment variable
-      # access regardless of the host operating system
-      shell: bash
-      working-directory: ${{github.workspace}}/build
-      # Note the current convention is to use the -S and -B options here to specify source 
-      # and build directories, but this is only available with CMake 3.13 and higher.  
-      # The CMake binaries on the GitHub Actions machines are (as of this writing) 3.12
-      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
-
-    - name: Build
-      working-directory: ${{github.workspace}}/build
-      shell: bash
-      # Execute the build.  You can specify a specific target with "--target <NAME>"
-      run: cmake --build . --config $BUILD_TYPE
-
-    - name: Test
-      working-directory: ${{github.workspace}}/build
-      shell: bash
-      # Execute tests defined by the CMake configuration.
-      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
-      run: ctest -C $BUILD_TYPE
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: "true"
+
+      - name: Install Doxygen
+        shell: bash
+        run: sudo apt-get install doxygen
+
+      - name: Create Build Environment
+        run: cmake -E make_directory build
+
+      - name: Configure CMake
+        # Use a bash shell, so we can use the same syntax for environment variable
+        # access regardless of the host operating system
+        shell: bash
+        working-directory: ${{github.workspace}}/build
+        # Note the current convention is to use the -S and -B options here to specify source
+        # and build directories, but this is only available with CMake 3.13 and higher.
+        # The CMake binaries on the GitHub Actions machines are (as of this writing) 3.12
+        run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=Release
+
+      - name: Build Documentation
+        working-directory: ${{github.workspace}}/build
+        shell: bash
+        run: cmake --build . --config Release --target doxygen
+
+      - name: Create .nojekyll (ensures pages with underscores work on gh pages)
+        shell: bash
+        run: touch doc/html/.nojekyll
+
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: gh-pages
+          folder: doc/html
+          # target-folder: /
+