Various CSS updates

Updates header dropdown
  - Makes dropdown size more reasonable
  - Adds color to link hover
  - Adds icons
Updates footer
  - copyright moved to right
  - made contact us button smaller
  - moves social icons to right, contact us button to left
Updates route for "My Reviews" to my_reviews
Updates CourseProfessor page
  - Moves professor dropdown to be more visiable
  - Updates color on dropdown
  - Updates borders