Re-evaluate Budgie Desktop spin's icon theme

[serebit]

To preface, I'm one of the developers of Budgie, and I checked out the ISO you have for Budgie for the purposes of seeing if it's good enough to recommend in the main "Getting Budgie Effortlessly" grid on our docs page.

After doing so, we came to the decision that we will recommend it, but we do have some feedback—namely that the icon theme that's set by default should probably be set to something that better fits the chosen widget theme (Numix). Both Papirus and Paper are shipped in the ISO already, and both would be preferable to what's currently set, as both have full coverage of Budgie's icon names and go pretty well with Numix. My personal recommendation is Papirus.

This isn't a blocker to being included on the docs page—we're doing that regardless—but I felt it would be a good idea to bring up the topic here.