update nn setup, utxo split and wif conversion docs

[smk762]

TODO:

• updates ports as required.
• update build instructions for chains, default Ubuntu 20.04. Add OS specific notes where required for 21.04, 22.04 and Debian if available.
• add doc to summarise PRs to be made on season change

[smk762]

Still waiting for

• ARYA to merge https://github.com/KomodoPlatform/AYAv2/pull/4
• SFUSD to merge https://github.com/pbcllc/sfusd-core/pull/22
• VRSC to update after HF, as is the tradition.

Need clarification re: which ports will be used for next season (to avoid season overlap on same ports)

Related dPoW PR: https://github.com/KomodoPlatform/dPoW/pull/410