Remove all mention & use of insecure randomness pallet

[nuke-web3]

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Content request

paritytech/substrate#13560 has removed the pallet, and shortly the devhub templates will be updated to remove it as well. We do not want people to use the pallet at all, so no examples or mention of it would be best to get in place asap.

Kown references to it:

• https://docs.substrate.io/build/randomness/
• https://docs.substrate.io/reference/how-to-guides/pallet-design/incorporate-randomness/

Are you willing to help with this request?

No.

[sacha-l]

I will help with this 🌈