This function is meant to help with renaming local student repos to include
something more useful like Last, First name
or a unique identifier
for the purposes of ordering repository folders.
local_repo_rename(repo_dir, pattern, replacement)
Character. Vector of repo directories or a single directory containing one or more repos.
Character. One or more regexp patterns to match to directory names.
Character. One or more text strings containing the replacement value for matched patterns.