Upgrade Admin Panel

[EnderHubris]

We would like to see a range of new features.

[EnderHubris]

Make sub-issues for the following

• solvers tab needs to be compact and accurate where first solver is always at the top of the list
• admins when viewing teams should be able to see details on completions and see the contribution pie-chart
• When editing challenges hide the flag value (make it password field)
• Solvers tab filter needs an option for challenge type