Alert User of Ethereum Connection Failures

[vinsonly]

• No web3 detected

  • notify users to that the user is not currently connected to the blockchain
  • include instructions on how to install metamask, create metamask account, and enable metamask interaction with coinbay

• web3 detected but no accounts are detected

• notify users to create / login to accounts

• if they are still not connected, tell them to enable metamask interaction with coinbay