Add gig work category to Thrive

[kkartunov]

We need Gig Work category in Thrive. Therefore changes needed are:

• Homepage - new section as per https://marvelapp.com/prototype/1hei31bg/screen/71426374
• Category page - as per https://marvelapp.com/prototype/1hei31bg/screen/72463989

[SathyaJayabal]

@kkartunov , gigs category page is not loading