[Bug]: Back button after logging out takes you back to the user's dashboard

[galee2]

Steps To Reproduce

1. Log out from Dashboard page
2. Press browser back butotn

The current behavior

Instead of showing the screens that apps usually show "You are trying to access a page that has expired" or whatever, it takes me back to the logged in dashboard page. When I reload, it shows the dashboard as a user that isn't logged in.

The expected behavior

Should not be able to access a previously logged in user's data or access the dashboard as a user not logged in through Google Auth.

[jameszhang-a]

Maybe inside the dashboard page, check if there's a user logged in. If not, either show an error page, or redirect back to landing page