[$150] Updated UI: Challenge Forums page

[atelomycterus]

@jmgasper In MarvelApp Challenge Forums page:

• Added Sorts
• Last discussions, Count Of Discussion/Comments
  

The current design:

[jmgasper]

Challenge https://www.topcoder.com/challenges/a0480f9a-0d92-4d8a-b931-e9ff26b9bfaf has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/a0480f9a-0d92-4d8a-b931-e9ff26b9bfaf has been assigned to obog.

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[atelomycterus]

@jmgasper Please apply PRs:
topcoder-platform/forums-theme#44
topcoder-platform/forums-groups-plugin#84

Thanks!

Testing

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