Fix remove favorites bug

- Event listener is now applied to all favorite elements
- Each favorite element now had the database favorite id assigned as an attribute
Refactor autosuggest search functionaility

- Remove from initialize.js
- Add search event to SearchController.js
- Add getArtist method in SearchController to get API artist data
Fix formatting

- Reorganize function initializations in initialize.js
- Remove whitespace in sessions_view and favorites_list