feat(theme): Branded theming via brand.yml #2964

Job	Run time
website / pkgdown	7m 22s
routine / routine	11m 8s
R-CMD-check / setup	6s
R-CMD-check / macOS-latest (4.4.2)	2m 34s
R-CMD-check / windows-latest (4.4.2)	3m 59s
R-CMD-check / ubuntu-latest (devel)	3m 14s
R-CMD-check / ubuntu-latest (4.4.2)	3m 54s
R-CMD-check / ubuntu-latest (4.3.3)	4m 3s
R-CMD-check / ubuntu-latest (4.2.3)	2m 23s
R-CMD-check / ubuntu-latest (4.1.3)	2m 28s
R-CMD-check / ubuntu-latest (4.0.5)	1m 26s
Deploy to shinyapps.io	0s
	42m 37s

Provide feedback