No Current Repo Error

[geoffreywiseman]

When no target is specified and gh actions-usage is invoked from a directory that cannot be linked to a GitHub Repository, we print error information so that the user can have a bit more information about why the current repository couldn't be found. That extra information clutters up the screen somewhat.

Would be nice to clean it up. Could be:

• add a verbose option flag and only print the extra error information when --verbose enabled
• parse the error so that we can provide cleaner error output
  • go-gh is just using strings here, so parsing it might be fragile