[website] Add update on George's departure from Bitcoin ABC

Summary: In case someone stumbles on the article announcing George as BizDev for ABC.

Test Plan: Tested the it builds and looks good, and the link works.

Reviewers: jasonbcox, deadalnix, #bitcoin_abc

Reviewed By: jasonbcox, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D7136