fix: make dbc install tell the user how to start a license (#272)

A user can run into this error state when they try to install a driver
without a license. It's pretty likely that they just need to start a
trial, so I think the error message should tell them how to do that.

With this PR,

```
$ dbc install oracle
failed to download driver: dbc-cdn-private.columnar.tech/oracle/v0.4.3/oracle_macos_arm64_v0.4.3.tar.gz: not authorized to access
Installing this driver requires a license. Verify you have an active license at https://cloud.columnar.tech/account and run `dbc auth logout` and `dbc auth login` again make your license available. Contact support@columnar.tech if you need assistance.
exit status 1
```

Closes #271

Author: amoeba

cmd/dbc/main.go

@@ -132,7 +132,7 @@ func (m baseModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				tea.Println(msgStyle.Render("Did you run `dbc auth login`?")))
 		case errors.Is(msg, dbc.ErrUnauthorizedColumnar):
 			cmd = tea.Sequence(tea.Println(errStyle.Render(msg.Error())),
-				tea.Println(msgStyle.Render("Do you have an active license for this driver? Contact support@columnar.tech for assistance.")))
+				tea.Println(msgStyle.Render("Installing this driver requires a license. Verify you have an active license at https://cloud.columnar.tech/account and try this command again. Contact support@columnar.tech if you need assistance.")))
 		default:
 			cmd = tea.Println(errStyle.Render("Error: " + msg.Error()))
 		}