feat(theme): Branded theming via brand.yml #2977

Job	Run time
website / pkgdown	4m 38s
R-CMD-check / setup	9s
routine / routine	4m 31s
R-CMD-check / macOS-latest (4.4.2)	3m 26s
R-CMD-check / windows-latest (4.4.2)	4m 9s
R-CMD-check / ubuntu-latest (devel)	2m 48s
R-CMD-check / ubuntu-latest (4.4.2)	2m 22s
R-CMD-check / ubuntu-latest (4.3.3)	2m 39s
R-CMD-check / ubuntu-latest (4.2.3)	2m 27s
R-CMD-check / ubuntu-latest (4.1.3)	2m 24s
R-CMD-check / ubuntu-latest (4.0.5)	2m 27s
Deploy to shinyapps.io	0s
	32m 0s

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