Remove Goerli from codebase

[kronosapiens]

Closes #1219

[kronosapiens]

@area do you have the syncFrom and colonyNetwork addresses for the rinkeby, ropsten, and kovan testnets? For the miner docs.

[area]

Are any of those still supported? I'm not sure if we ever ended up on ropsten or kovan.

[kronosapiens]

Noting that we are on Arbitrum-Sepolia but not the other testnets, at 0x7777494e3d8cce0D3570E21FEf820F9Fee077777

[kronosapiens]

@area do the docs need to be updated to go from Ethereum mainnet to Arbitrum mainnet?

Also, do we need to migrate off of InfuraProvider as IIRC that only support L1 chains?

https://docs.metamask.io/services/reference/arbitrum/quickstart/#ethers

[area]

@area do the docs need to be updated to go from Ethereum mainnet to Arbitrum mainnet?

I don't see why we shouldn't, I'm always going to be pro-keeping-docs-up-to-date.

Also, do we need to migrate off of InfuraProvider as IIRC that only support L1 chains?

That doesn't seem to be the case?. I'd be more than happy to regardless though as you can just pass an Infura endpoint to a 'normal' JSONRPCprovider, right?