UI: Setup page "Go To Login" should be a link instead of button

[ozkatz]

Currently when setting up lakeFS for the first time, the user is greeted with a set of credentials (and a note to keep them safe since they will never see them again).

Beneath there's a button saying "Go To Login". Since it's a button, there's no way for the user to tell whether or not clicking it will navigate away from the setup page, losing access to these precious credentials. Additionally, there's no way to explicitly open in a new page, since it isn't a link that could be middle/right clicked/long pressed..

I suggest changing it from a button to a link with target="_blank" to allow this.

Additional supporting reasons: the button is used only for navigating to another URL and has no other side effects. Semantically, that's a hyperlink...