Add sorting feature on the coding competitions page

[NayakPenguin]

When you click on that sort button a drop-down will occur with some specific types of sortings. Please read about the whole task here in this google doc : https://docs.google.com/document/d/1zO3lE-YQSInsA9sFoFC8O7ImOHdjVceL2pqHPnYat-8/edit?usp=sharing

[ThorezNS]

Please assign me