FEATURE: Session expiration redirect to login page

### Feature
**Overview**
When the session expires, redirect the user to the login page

**Details**
Currently no redirect happens, content simply stops updating with 403 errors, then on refresh the user is navigated to the index.html page rather than the login page

**Tasks**
- [x] Throw 401 error when the session expires
- [x] Catch 401 error and redirect to the login page
