Admin flow fixes and bulk uploads

What's New:
- Admins can bulk-upload new employees from CSV
- Profile edit links reflect current user privileges

Bug Fixes:
- Initial signup logic
- Removed leftover logger debug code
- Fixed permission checks for regular users
New filtering capabilities and profile fields

What's New:
- Added location and title fields to the employee profile
- Added ability to filter employees by role or location
- New navbar
Merge branch 'ux_improvements_1'