Added callbacks for node errors and fifo overflow

Add new doc system which should/might deploy to pages.

.gitea/workflows/test.yaml

@@ -41,7 +41,7 @@ jobs:
             -G Ninja \
             -DCMAKE_BUILD_TYPE=Debug \
             -DKPN_BUILD_TESTS=ON \
-            -DKPN_BUILD_EXAMPLES=OFF \
+            -DKPN_BUILD_EXAMPLES=ON \
             -DKPN_BUILD_PYTHON=ON \
             -DFETCHCONTENT_BASE_DIR=$HOME/.cmake/fetchcontent
 
@@ -49,18 +49,26 @@ jobs:
         working-directory: test-${{ github.run_id }}
         run: cmake --build build --parallel
 
-      - name: Run tests
+      - name: Run unit tests
         working-directory: test-${{ github.run_id }}
         run: |
           cd build
-          ctest --output-on-failure --output-junit test-results.xml
+          ctest --output-on-failure --output-junit test-results.xml --label-exclude examples
+
+      - name: Run example smoke tests
+        working-directory: test-${{ github.run_id }}
+        run: |
+          cd build
+          ctest --output-on-failure --output-junit example-results.xml -L examples
 
       - name: Upload test results
         if: always()
         uses: actions/upload-artifact@v3
         with:
           name: test-results
-          path: test-${{ github.run_id }}/build/test-results.xml
+          path: |
+            test-${{ github.run_id }}/build/test-results.xml
+            test-${{ github.run_id }}/build/example-results.xml
           retention-days: 7
 
       - name: Cleanup