docs: add `Using gnokey` tutorial (#2226) #65

Job	Run time
Run Main (autocounterd) / Go Build / generated	8s
Run Main (autocounterd) / Go Linter / lint	27s
Run Main (autocounterd) / Go Test / test	32s
Run Main (docker-integration) / Go Build / generated	4s
Run Main (docker-integration) / Go Linter / lint	9s
Run Main (docker-integration) / Go Test / test	11s
Run Main (genproto) / Go Build / generated	6s
Run Main (genproto) / Go Linter / lint	38s
Run Main (genproto) / Go Test / test	37s
Run Main (genstd) / Go Build / generated	5s
Run Main (genstd) / Go Linter / lint	18s
Run Main (genstd) / Go Test / test	19s
Run Main (goscan) / Go Linter / lint	16s
Run Main (goscan) / Go Build / generated	4s
Run Main (goscan) / Go Test / test	12s
Run Main (logos) / Go Build / generated	9s
Run Main (logos) / Go Linter / lint	28s
Run Main (logos) / Go Test / test	41s
Run Main (loop) / Go Build / generated	8s
Run Main (loop) / Go Linter / lint	34s
Run Main (loop) / Go Test / test	38s
	6m 44s

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