Git completion is quite slow.  The zsh folks had some reasons for not
fixing it perhaps, but whatever is going on, the slowness is the reason
I abandoned zsh last time around.  This time, I found some updated
git-completion stuff, and hooked it in to fpath, so now it appears good.

Ivy completion
org-roam fiddling
yas snippets
etc

 * Enable layering gui settings on top of config
 * Add dark mode
 * adjust user agent string
 * changelog display level, make it less chatty