Document how to be a node operator of Lido in Dappnode

[pablomendezroyo]

Document how to be a node operator of Lido in Dappnode.

[pablomendezroyo]

In the existing section user docs > ethereum > staking > lsd-pools (https://docs.dappnode.io/docs/user/staking/ethereum/lsd-pools/rocketpool) add a new section lido documenting how to become a node operator in dappnode for Lido.

This new section will include in its first approach (Tier 0) a how to become a node operator in Lido following the steps:

• Setup infra in dappnode to run ethereum validator
• Create Keystores with Lido's withdrawal credentials
• Follow the steps in UI https://csm-devnet.vercel.app/ to become a node operator
• Upload kyestores to brain with Lido's fee recipient
• Mev boost relays are mandatory

After implementing tier 1 2 and 3 there must be added the corresponding documentation on how to manage the node operator with the UI

[pablomendezroyo]

Depends on https://github.com/dappnode/StakingBrain/issues/318