Add a note about generating REPL docs
Support --repl for dokx-update-from-git

Also use 'optional string' for repo arg instead of 'none' placeholder
Add comment for getFileString function
Rename 'packageName' var to 'namespace'
Rename 'packageName' var to 'sectionName'
Remove stub for feature that isn't needed for now
Remove dokx-combine-markdown script - not needed
Adjust formatting of usage text