Proposing git submodules for in-sync repository access

[i0bs]

Seeing from setup.sh that the documentation for other libraries are being built from their repositories, I would like to propose using git submodules instead, like the studio path in this repository. It would allow finer control over synced repository changes for documentation, and since GitHub will recognise the latest commit, you can always pin to a certain commit hash, or keep it up-to-date.