message: Fix positioning/displaying the login button
diff: +{{#cardstack-edges}}
  + {{#squishable-container}}
  {{#cardstack-session as |session|}}
  {{#if session.isAuthenticated }}
  <button id="logout-button" {{action session.logout}}>Logout {{session.user.name}}</button>
  {{/mock-login}}
  {{/if}}
  {{/cardstack-session}}
  -
  -{{#cardstack-edges}}
  - {{#squishable-container}}
  {{outlet}}
  {{/squishable-container}}
  {{/cardstack-edges}}
  \ No newline at end of file
  