Add markdownlint CI job and fix broken doc links #41

Job	Run time
fmt	8s
test (modules/quilt/tests/smoke)	24s
test (modules/vpc)	26s
validate (modules/search)	17s
validate (modules/quilt)	15s
validate (modules/db)	16s
validate (modules/cnames)	15s
markdownlint	5s
validate (modules/vpc)	18s
	2m 24s

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