Updating Retcon’s icon for Tahoe

A tour of some of the iterations the [Retcon](https://retcon.app) icon went through for its macOS Tahoe update, and the reasoning behind the changes. 00:00 Intro 00:47 Motivation 01:30 First direction: the obvious update 03:43 Matching Xcode 05:42 Second direction: a different layout 12:24 Refining the rendering 19:41 Final touches