Add markdownlint CI job and fix broken doc links #42

Job	Run time
test (modules/vpc)	25s
validate (modules/quilt)	16s
validate (modules/cnames)	12s
test (modules/quilt/tests/smoke)	25s
fmt	5s
markdownlint	5s
validate (modules/vpc)	13s
validate (modules/search)	17s
validate (modules/db)	18s
	2m 16s

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