Create GH action to auto-create documentation (#82)

- updated Doxyfile to current doxygen version
  (using doxygen -u)
- minor documentation fixes

Author: mrbean-bremen

.github/workflows/builddocs.yml

@@ -0,0 +1,32 @@
+name: Build and Deploy Documentation
+
+on:
+  push:
+    branches: 
+      - master
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build_docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout master
+        uses: actions/checkout@v3
+
+      - name: Install Doxygen
+        run: sudo apt-get install doxygen graphviz -y
+
+      - name: Build documentation
+        run: |
+          cd doxygen 
+          doxygen
+          touch html/.nojekyll
+          cd ..
+        
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: doxygen/html