[e.cash] Remove video rotation on landing page

Summary: removing the slight rotation on the 'introducing ecash' section's video, as it doesnt add much and some users found it out of place

Test Plan: preview the site and check the video

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16298