[e.cash] Add agora.cash, update MUSD

Summary:
Adding agora.cash to /build products built with section, and updating the TUSDT to MUSD per their website.
Adjusting entrance timing on /build products tiles

Test Plan: preview and check /build and /use-ecash

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D18753