If you want to migrate projects from SmalltalkHub (or any MCZ-based repo) to GitHub to profit from new git integration in Pharo then use Peters "git-migration" tool.
The tool is now using the Tonel format to store the code. Tonel is a file-per-class format,
that means a class and all methods are stored in a single file. This is faster than having a file for each method but also prevents some trouble with git on Windows due to number of files and subdirectory depth.