feat: document cli create-key command

[florian-lefebvre]

Description (required)

create-key was shown on the server islands guide, but not on the CLI reference

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[yanthomasdev]

nit

Suggested change

	Generates a key to encrypt props passed to Server islands, see [how to reuse the encryption key](/en/guides/server-islands/#reusing-the-encryption-key).
	Generates a key to encrypt props passed to server islands, see [how to reuse the encryption key](/en/guides/server-islands/#reusing-the-encryption-key).