added settings page with logout button

[Cowpriest]

I replaced the settings placeholder with a settings.dart that has the functional logout button.

Probably should have added this with the login page.

[WERDXZ]

Make this page looks better, we should have more functionalities like switching themes etc. Just create placeholders for now, I think putting the Logout Button at bottom of the page is a good idea

[Cowpriest]

Obviously this is just a better placeholder that has a functional logout button. Beautification comes later in another issue/PR. The point of this is to have something we can work with while everything is up to date on main. This needs to be accepted before I'm going to make any more changes so I can ensure its still functional after the merge.

[maxbutevil]

Looks good