Make native applications for iOS and Android with Turbolinks

See turbolinks 5 presentation for how to do this https://www.youtube.com/watch?v=SWEts0rlezA

Start with using mobile views everywhere and improving these.

Native parts:

1. Login (store credentials indefinitely so I don't have to log in again)
2. Error/refresh page
3. Rating according to modern practices
4. Main navigation page?
5. Hamburger menu pop-up as shown in the presentation?
6. Todo's to make them more usable?

We hire one person for this:

1. Does both iOS, Android, and mobile views
2. Reports to the frontend lead
3. Most time spent improving the mobile views

We should approach all the authors of the native apps https://about.gitlab.com/applications/ for this job.

What do @stanhu @DouweM @dzaporozhets @jschatz1 and @JobV think?