Issue #2938190 by smaz, markconroy, navneet0693, Gvert, John Cook, Adam_Moulsdale, sastha, Eli-T, Sutharsan, JayKandari, lauriii, xjm, larowlan: Create a favicon for Umami

Issue #2938686 by Adam_Moulsdale, andrewmacpherson: Pink button/link style in Umami fails WCAG 2.0 SC 1.4.3 Contrast (minimum)

Issue #2939724 by ryanhayes, joachim, Samvel, andrewmacpherson, sacha@wellborn.co.uk, Adam_Moulsdale, rachel_norfolk: wrong variable name in sample code

(cherry picked from commit 441f198b)