Add network configuration specs for subtensor nodes

[rajkaramchedu]

Add network configuration specs in the docs on running a public subtensor: https://docs.bittensor.com/getting-started/running-a-public-subtensor

See the network config specs in https://github.com/opentensor/subtensor?tab=readme-ov-file#network-requirements and check with @eduardogr.

[rajkaramchedu]

#124