User access_token expiration is not handled

[ionwyn]

At the moment, (mostly because I'm lazy), user access token expiry is not handled. This causes the site to loses user's data.

This is easily handled since, during login, our authentication method gives us initial access token and a refresh token. Refresh tokens can be used to generate a new access token. We can either

• Update the access token when accessing data returns fail
• Keep track of access token expiration, updating when the timer expires.