Better layout for new users

[Botffy]

Users with no rides are presented with a rather confusing situation: they can click all the menu items, but all pages show the very same view:

Proposed solution
When the user has no rides, we should hide the menu items pointing at the stat pages and show the current page, except with an expanded tutorial/introduction about the thing.

fyi @egkrly

[egkrly]

We can attach there screenshots. Also we can have a nice svg's and some description about the page, like these: https://undraw.co/illustrations

Also I recommend to mark somehow the active page. Maybe we could have a title or something, on mobile it's pretty hard to identify which page you are looking at.