Generate documentation from Commodore components

[simu]

We previously experimented with Doxygen to auto-generate some API documentation for components (especially components which provide libraries for other components to use). Integrate generating documentation from Doxygen comments into the documentation infrastructure and document how to document components (e.g. using file-level Doxygen comments).

This will only become relevant once components have been migrated from the VSHN internal GitLab to GitHub.

Task deliverables

• Commodore component Doxygen comments are rendered and displayed alongside the rest of the documentation
• How to document components is documented