Add some explainer text around deposits

The Chore

Think a bit of basic text might be useful to help explain how and when to use each of the deposit flows.

[x] Change the tab name to "Deposit: Basic"
[x] Add some text in a blue info box at the top which says "Use this form to deposit Ethereum or Arbitrum assets to the Vega network"

[x] Change the tab name to "Deposit: Cross-chain"
[x] Move the tab to be to the right of "Deposit: Basic" tab
[x] Add some text in a blue info box at the top which says "Use this form to utilise Squid Router to make cross-chain deposits from any supported chain or wallet onto the Vega network. To ensure users enjoy the cheapest fees possible this mode only supports deposits into Arbitrum assets."
[ ] Change the "Receive" label to be "Deposit to Vega"