chore: bump version

refactor: separation of concerns for filesystem, git operations

Fix issue where recursive directories causing errors

If a recursive source directory (e.g. "a/b/") is specified,
flatten the final result such that the end result only copies the
final child directory (no parents): "desired/destination/b"

MVP of gitdl

Bug wherein subdirectories fail to be copied from src to dst.
Most likely an issue with filepaths, further investigation required.