RIOT has various documentation sources in this folder, including:
Starlight is the main documentation site for RIOT, located at
guide.riot-os.org,
the starlight directory itself mostly only holds the source files for the site,
excluding most guides which are stored within guides.
If you wish to contribute new guides or find out more, please see Creating Guides & How Starlight Works.
Doxygen is the home of all the API documentation,
located at api.riot-os.org.
The doxygen directory holds the source files for the API documentation,
which is generated from the RIOT source code (header and doc.md files) itself.
New guides should not be added directly to the Doxygen documentation, but rather to the Starlight site, which can then link to the API documentation as needed, unless the guide is very specific to the API and would not fit well within the Starlight site.