Add markdownlint CI job and fix broken doc links #43

Job	Run time
fmt	7s
test (modules/vpc)	28s
markdownlint	6s
test (modules/quilt/tests/smoke)	25s
validate (modules/vpc)	14s
validate (modules/db)	15s
validate (modules/cnames)	12s
validate (modules/search)	15s
validate (modules/quilt)	16s
	2m 18s

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