[e.cash] Add wallets page

Summary: Adding the base of the wallets page to the site. Will add the faqs at the bottom in another diff

Test Plan:
Preview the site and navigate to /wallets page
inspect everything looks good and links work

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D14084