Add repo-level json schema docs config #252

Job	Run time
R Package Checks / revdeps-check	0s
R Package Checks / codecov / test-coverage (ubuntu-latest)	1m 18s
R Package Checks / r-cmd-check / macOS-latest (release)	1m 13s
R Package Checks / codecov / test-coverage (windows-latest)	2m 1s
R Package Checks / r-cmd-check / windows-latest (release)	2m 20s
R Package Checks / codecov / test-coverage (macOS-latest)	1m 16s
R Package Checks / r-cmd-check / windows-latest (4.1)	4m 18s
R Package Checks / r-cmd-check / ubuntu-latest (release)	1m 30s
R Package Checks / r-cmd-check / ubuntu-latest (devel)	1m 31s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-1)	1m 44s
R Package Checks / deps-main-check / deps-main	1m 52s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-2)	1m 37s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-3)	1m 55s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-4)	1m 34s
R Package Checks / check-R-updates / updated-files	10s
R Package Checks / docs-check / docs-check	1m 31s
R Package Checks / lintr / lint	1m 20s
R Package Checks / version-check / version-check	39s
	27m 49s

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