HR Services time off front end (admin view)

[ThomasBenissan]

Refactor HR services admin view to be in line (interface style and code style) with existing time off code.

Requirements:

• Refactor calendar
• Refactor pending employee requests acceptance/rejection/updates
• Double check connection with backend
  • Ensure admin can view all time off requests
  • Ensure manager can view all time off requests
  • Allow admin and HR to accept/decline requests
  • DB should update with acceptance/decline

[andrewtlu]

Need to redo, see PR #50 notes