ci: Build docs in CI #214

Job	Run time
routine / routine	1m 27s
routine / routine	1m 34s
R-CMD-check / setup	49s
R-CMD-check / setup	49s
R-CMD-check / macOS-latest (4.4.2)	1m 25s
R-CMD-check / macOS-latest (4.4.2)	1m 25s
R-CMD-check / windows-latest (4.4.2)	2m 8s
R-CMD-check / windows-latest (4.4.2)	2m 8s
R-CMD-check / ubuntu-latest (devel)	1m 53s
R-CMD-check / ubuntu-latest (devel)	1m 53s
R-CMD-check / ubuntu-latest (4.4.2)	1m 54s
R-CMD-check / ubuntu-latest (4.4.2)	1m 54s
R-CMD-check / ubuntu-latest (4.3.3)	1m 28s
R-CMD-check / ubuntu-latest (4.3.3)	1m 28s
R-CMD-check / ubuntu-latest (4.2.3)	2m 26s
R-CMD-check / ubuntu-latest (4.2.3)	2m 26s
R-CMD-check / ubuntu-latest (4.1.3)	2m 1s
R-CMD-check / ubuntu-latest (4.1.3)	2m 1s
R-CMD-check / ubuntu-latest (4.0.5)	1m 37s
R-CMD-check / ubuntu-latest (4.0.5)	1m 37s
	34m 23s

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