Add THRIVE to submenu

[Oanh-and-only-Oanh]

For Logged out AND logged IN users, add THRIVE to the navigation menu under EXPLORE next to Blog

THRIVE should direct users to https://www.topcoder.com/thrive

[luizrrodrigues]

@Oanh-and-only-Oanh @nithyaasworld @sachin-maheshwari
This one was fixed/deployed and ready to test.

[SathyaJayabal]

verified