Add Lodestar to the validator checklist

[philknows]

An addendum to #541 , Lodestar was not included on the validator checklist.

Here are the following links to include for the modification of that page:

Default Port: 9000 TCP/UDP Discord Link: https://discord.gg/642wB3XC3Q Consensus JWT docs: https://chainsafe.github.io/lodestar/usage/beacon-management/#configure-the-lodestar-jwt-authentication-token Fee recipient docs: https://chainsafe.github.io/lodestar/usage/validator-management/#configuring-the-fee-recipient-address Monitoring docs: https://chainsafe.github.io/lodestar/usage/prometheus-grafana/