Incompatibility between links on GitHub and GitDocs links

[ptbrowne]

GitDocs routing transforms 'index.md' into '/index' thus the user must write [Index](/index) when cross-referencing docs. This means links do not work when on GitHub. We have extensive docs written with GitHub routing in mind, so if switching to GitDocs we would have to change all of our links and we would lose links on GitHub. Why has GitDocs a routing system that is incompatible with GitHub ? Could there be a config flag to switch between GItHub routing or GitDocs routing ?