feat(theme): Branded theming via brand.yml #2965

Job	Run time
website / pkgdown	7m 12s
routine / routine	8m 7s
R-CMD-check / setup	9s
R-CMD-check / macOS-latest (4.4.2)	2m 33s
R-CMD-check / windows-latest (4.4.2)	3m 22s
R-CMD-check / ubuntu-latest (devel)	2m 50s
R-CMD-check / ubuntu-latest (4.4.2)	2m 31s
R-CMD-check / ubuntu-latest (4.3.3)	2m 37s
R-CMD-check / ubuntu-latest (4.2.3)	2m 42s
R-CMD-check / ubuntu-latest (4.1.3)	2m 16s
R-CMD-check / ubuntu-latest (4.0.5)	2m 24s
Deploy to shinyapps.io	0s
	36m 43s

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