If JWT is expired, automatically navigate to login page

[aiden-gonzalez]

Right now if you go to the site and the browser has a stored JWT in cookie, it will take you to dashboard because it believes you are logged in. However the server will reject the JWT and you won't be able to see any data until you sign out and then sign back in again. Fix this somehow (maybe add loading screen or something?) to check with the server if the JWT is actually still valid before putting user on logged-in state.

RELATED: #32

[aiden-gonzalez]

May be able to quickly solve the issue if the cookie expiration on the client matches the server JWT expiration.