Migrate Member Search Feature on Community App

[ajefts]

Migrate the search feature into community app as opposed to trying to update the nav on that old topcoder-app. topcoder-app should be deprecated.

Front-end code

https://github.com/appirio-tech/topcoder-app/blob/dev/app/layout/header/header.jade

https://github.com/appirio-tech/topcoder-app/tree/dev/app/member-search

[ajefts]

Link to feature: https://tcprod.productboard.com/feature-board/planning/features/3613959

[SathyaJayabal]

Migration should fix issue reported in #3530

[LieutenantRoger]

Challenge Link to address this feature: https://www.topcoder.com/challenges/30115867/?type=develop