bug 1038167 - Update icons for Find My Device, Vertical Homescreen, Smart Collection and System App
Bug 1038103 - Generate documentation from source code and publish to readthedocs.org. r=wlachance r=zcampbell
Merge pull request #21913 from nullaus/bug1038167

bug 1038167 - Update icons for Find My Device, Vertical Homescreen, Smar...
Bug 1034565 - CSSLint complains about CSS Variables r=vingtetun