docs(examples): add custom website bucket policy example #292

Job	Run time
validations (examples/ordered-cache-behavior)	56s
check-format	9s
validations (examples/complete)	55s
validations (examples/no-cert)	56s
validations (examples/no-cert-no-hosted-zone)	1m 2s
validations (examples/no-hosted-zone)	53s
	4m 51s

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