* Replace Help / About Serpent window background
* Copy new web.whatsapp.com SSUAO from PM to Serpent
* Revert last commit & future-proof whatsapp SSUAO
1. Reverted previous commit as unnecessary. Web.whatsapp.com will work with a FF SSUAO as well as a Chrome one.
2. Changed FF rv for whatsapp.com from 61.0 to 68.0 so whatsapp will consider Basilisk & Serpent "up to date" for a while longer
* Fix file ext. to show "Serpent" wordmark
Style sheet was attempting to load about-wordmark.png but actual file is about-wordmark.svg
* Update about-wordmark.svg
* New royalty-free Help / About background image