[#20] Fix profile URL to be accessed by both admins and contributors

Closes #20 (closed)

This MR consists of:

• Combining admin and contributor profile view
• Combining admin and contributor profile edit view
• Add role display on profile and edit profile pages
• Refactor pre-existing related tests
• Update all URLs and references to mentioned views

Sonarqube report here. (False alarm on security hotspot, the password parameter is used for testing; duplications on untouched parts of the code)