I wrote previously about the Simplest way to add script to your SharePoint and SharePoint Online.
Although this is a simple, stand-alone page, it is something I can see being updated going forward, and with some minor prodding from Marc Anderson, I moved forward my plans to put it out there publically.
It also means I can now just link to that one place, and as I make updates to the page, people won't be going to the old version 1.
It's here on GitHub. https://github.com/johnnliu/UserCustomActionsConfigPage
I still have a few more articles on branding that I wanted to write under this banner and I think Marc is going to link it up with requirejs.