PR CMD check & build site

add _pkgdown.yml and .github/workflows/pr_check.yml GHA #1

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Run time

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Job	Run time
set-matrix	1s
set-matrix	1s
check (RELEASE_3_21)	10m 32s
check (RELEASE_3_21)	10m 32s
deploy	4s
deploy	8s
dock	0s
dock	0s
	21m 18s