Update testnets config: add Paseo, remove Wococo

[PierreBesson]

• Add Paseo config: https://forum.polkadot.network/t/the-new-polkadot-community-testnet/4956
• Remove Wococo config as the network is now shut down: https://wiki.polkadot.network/docs/maintain-networks#wococo-test-network-inactive

[mordamax]

@PierreBesson will you or someone else look after the paseo balances?

[mutantcornholio]

@mordamax I believe that we should be responsible for it, for the sake of consistency. At least, setting up the alerts and reacting to them.