docs: warn users about https requirement

[darmbrust]

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[linux-foundation-easycla]

• ✅login: darmbrust / (dc57e43)

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[floreks]

Thanks! That's helpful. We might want to try to detect it and display a more suitable error message.

[floreks]

@darmbrust could you sing the CLA?

[maciaszczykm]

/lgtm

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