Better wait-state when loading initial OTP route

[kpwebb]

Currently when returning to the site we have a blank-screen pause while OTP loads. We need to have something on the screen other than a blank page while the data loads. And re #47 we need to handled failed trips without dying on a blank screen.

[kchanba]

Is this an issue on the last welcome flow page? We spoke about having scrolling service providers, or an animated graphic. I will work on these pieces

[trevorgerhardt]

No, this is post-welcome flow. It's when you go to the site for the second time on and see a blank white screen because the route hasn't loaded yet. In the past I was caching the last journey and showing that, but that caused problems.

This screen could be the same as if no results came back from OTP. Maybe a faint background image with one text prompt that indicates it's loading, and another text prompt that indicates that no results were returned and why.

Definitely related to #47 & #48

[kchanba]

I think that would work well