feature: expose readinessProbe to the config file for chain, add to doc, fix readinessProbe #993

Job	Run time
pr-test (one-chain-custom-scripts.yaml)	3m 36s
pr-test (one-chain.yaml)	3m 54s
pr-test (one-custom-chain.yaml)	3m 31s
pr-test (multi-validator.yaml)	3m 45s
pr-test (simapp.yaml)	6m 7s
pr-test (one-chain-starship-faucet.yaml)	3m 12s
pr-test (multi-validator-starship-faucet.yaml)	3m 5s
pr-test (one-chain-cometmock.yaml)	2m 52s
pr-test (one-cosmoshub-starship-faucet.yaml)	3m 16s
	33m 18s

Provide feedback