SVG images will look sharper and scale more cleanly. However they are
not supported on older browsers[1]
> The <picture> element allows for fallback images when the browser
> doesn't support a specified image format.
`<picture>` is supported in the latest versions of Chrome, Firefox, IE
(Edge), Safari and Android, so all these browsers will get the SVG
version.
Older browsers will fall back to the PNG version.
[1] http://caniuse.com/#feat=svg
[2] https://css-tricks.com/a-complete-guide-to-svg-fallbacks/#fallback-svg-as-img-picture
[3] http://caniuse.com/#feat=SVG
This commit adds a 3 screen tour, similar to those used on GOV.UK Verify
and Passports.
We guerilla tested this on Friday, and it really helped users to build a
mental model of how Notify works, so that when they’re playing around
with it they have a greater sense of what they’re aiming to do. This
makes concepts like templates and placeholders click more quickly.
https://www.pivotaltracker.com/story/show/116710119
