Added several pieces of functionality related to Admin views:
- Changed link for admin panel access.
- Added a new group (Moderator) created within admin panel, which can view Project/UserIdentifiers and has full CRUD permissions for Issues.
- Added an unapproved issues filter to admin panel.
- Changed Issues display in admin panel from str to list display with issue_title, linked_project, and reviewer_status.
- Added a bulk approval method for unapproved issues and tested (successfully posted to Gitlab.)