This documentation gets deployed to: https://docs.coronalabs.com/
Engine source can be found here
Documentation lives in markdown/ directory. Note that it does not use GitHub flavored Markdown, but rather its own flavor.
Plugin documentation lives in a submodule. Mind it when checking out. Submodule documentation is auto-generated and not intended to be edited manually.
To build documentation yourself from bin directory run lua build.lua. Make sure Lua has LFS (Lua File System) accessible.
To build docs with docker (same as production) run
docker run --rm -it -v "$(pwd)":/src --workdir /src/bin --entrypoint /usr/bin/lua coronalabs/docs build.lua