docs: recommend using main branch for action #199

Job	Run time
docs / lint	11s
actions / update	10s
lint_commits / lint_commits	13s
helm_lint / lint	17s
release_please / release_please	22s
supergraph_generate / generate	6s
docs / build	13s
supergraph_publish / publish	15s
docs / publish_gh_pages	10s
	1m 57s

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