Add timeout modal

Timeout modal pops up after 7 minutes. User can then choose button if they're still there, it returns to the page OR if they are not, it restarts the session and redirects to the first page. If nothing is done on the modal, after another 3 minutes, it restarts the session and redirects to the first page

- [ ] Created modal partial _timout.html.erb
- [ ] Needs to be made dynamic