feat(astro): add sensible default canonical url (#437) #757

Job	Run time
CLI Integration Test Matrix (ubuntu-latest, 18)	3m 0s
CLI Integration Tests	1s
CLI Integration Test Matrix (ubuntu-latest, 20)	2m 54s
CLI Integration Test Matrix (ubuntu-latest, 22)	2m 39s
CLI Integration Test Matrix (macos-latest, 20)	3m 38s
CLI Integration Test Matrix (windows-latest, 20.13.1)	6m 26s
	18m 38s

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