[e.cash] Build page bento grid

Summary:
Adding the bento grid to the build page
The mockup uses the same content from the homepage so just using the same component
here, as well as the same scroll element from the developers section of homepage

Test Plan: preview and check

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D18433