[e.cash] Add hero section content

Summary:
Adding some content to the top section of homepage

• Added text and the social links, will do button in seperate diff

Test Plan:
Either run the app locally with npm run dev or generate a preview build with @bot preview-e.cash
Inspect content. Should look good and be responsive

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D13799