View all decks (landing page)

We want a central page where users can see all their decks and maybe add "could haves" in the future (leader boards, study stats)

As a user, I want to be able to:

• Have a landing page that contains:

1. A place to get started/add decks
2. A list of all my decks
3. A log out area

so that I have a clear "homepage" to make navigating the app easier