Actually use apiPath when mounting the docs #1376

Job	Run time
website / pkgdown	2m 42s
routine / routine	3m 22s
R-CMD-check / setup	1m 51s
R-CMD-check / macOS-latest (4.4.2)	2m 39s
R-CMD-check / windows-latest (4.4.2)	3m 31s
R-CMD-check / ubuntu-latest (devel)	2m 54s
R-CMD-check / ubuntu-latest (4.4.2)	3m 18s
R-CMD-check / ubuntu-latest (4.3.3)	3m 9s
R-CMD-check / ubuntu-latest (4.2.3)	3m 14s
R-CMD-check / ubuntu-latest (4.1.3)	3m 8s
R-CMD-check / ubuntu-latest (4.0.5)	5m 10s
	34m 58s

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