Fix issue with subdirectories
Use list-group
Change site title
Replace sub_directory with sub_categories; Add to Sinatryll::SITE.categories upon initialization
Remove site paramenter from initialize, Add to Sinatryll::SITE.notes upon initialization, fix create_path
Remove category creation from site initialize
Add constants to Sinatryll module
Change sub_directories to sub_categories
Add .noterconfig.yml file for site configuration
Change title to NoteDown
Change name to NoteDown
Change name to NoteDown
Change app name to NoteDown
Change app name to NoteDown
Change app name to NoteDown; Add get_categories method
Change app name to NoteDown
Change app name to NoteDown
Use site.get_categories for categories list instead of site.categories
Add listing of sub category notes
Change app name to NoteDown