[e.cash] Add story section content

Summary:
Adding the content for the story section of the homepage.
Includes the paragraph and the video. The button will be added when that page is made

Test Plan:
@bot preview-e.cash
Check it looks good on both themes

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman, Fabien, Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D13862