[e.cash] Homepage copy tweaks

Summary:
In the "What we do" section changing the button text to "Our Roadmap" and swapping the little blue tags on the images as they make more sense this way

Also fixing the description of NowNodes in the quote section

Test Plan: preview and check

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D18674