[WIP] add C API reference to docs using auto tool (#368)

* [add] add C API reference to docs using auto tool ( python3 generate_llapi_reference.py )

* [add] generating C API reference on the fly

* [add] moving api_reference under Developer Nav

Co-authored-by: Luca Antiga <[email protected]>

Author: filipecosta90

.github/workflows/deploy-docs.yaml

@@ -21,6 +21,8 @@ jobs:
         python-version: '3.x'
     - name: Display Python version
       run: python -c "import sys; print(sys.version)"
+    - name: Install Doxygen
+      run: apt-get install -y doxygen
     - name: Install docs dependencies
       run: pip install -r docs/requirements.txt
     - name: Get entire project