Create 50/50 Member Welcome Page

[hokienick]

@kkartunov will be creating this page and will have the url being created in ticket #4847 .

This page should not have a header navigation and only 2 buttons. One that goes to the Gigs Listings page on one that goes to the Practice page.

[kkartunov]

Required look and feel: https://marvelapp.com/prototype/535c9ga/screen/72461895

[SathyaJayabal]

verified on staging