User

- remove biography controller
- revise schema to use Users table that has biography and not a separate Biographies table
- set up basic views for Samora Pinderhughes
- adjust side-nav bar for better mobile viewing
- set up devise
- set up independent users_controller. 

debating keeping users_controller for #edit, #update or just running all that through Devise controller (as #create is thru Devise::RegistrationsController sign_up)