[FEAT|frontend|backend] Admin Page

[JoshiCodes]

An admin page to edit all server-specific settings, such as:

• User management
  • View all Users
  • Edit/add/delete User
  • Create User
• Frontend design
  • Add navbar links (e.g. privacy policy)
  • Add footer links
  • Change Theme settings (optional)
    • Theme
    • Name
• Edit Limits (upload limit, project limit per user, settings per project, etc.)
• View and Edit all projects