This is web project is related to OsmAnd Maps & Navigation and it's present as a main website in /main folder, Blog /main/blog/, User documentation /main/docs/user/ - All as Docusaurus part. Also OsmAnd Web Map (React web project) /map that includes Map route planner, access to OsmAnd Cloud, Track editing, Weather, Search on map and other tools.
If you are asked about to help about OsmAnd product you need to search first in folder /main/docs/user/ among *.md files. The documentation is mostly complete.
OsmAnd web project is located in the /map folder and it shares only header with main Docusaurus project.