Update homepage to show benefits

[frankieroberto]

This updates the homepage to more clearly show the benefits of using the NHS prototype kit.

Resolves #50.

Inspiration taken from the NHS Notify homepage and a previous mockup from @vickytnz.

Screenshot

[sarawilcox]

I like it.

We wouldn't usually include adjectives like "valuable" but I see that GOV does and here we're trying to persuade people, not just give the facts, so I think we can leave it in.

I wonder if we should mention that the prototypes are interactive. Under the Realistic heading, would it work to say:

"Create interactive prototypes that behave like the real thing, across devices, using styles and components from the design system"

[frankieroberto]

@sarawilcox nice idea, I like 'interactive' as it's a point of differentiation between static designs done in an illustration tool.

Here’s how that looks (I dropped "styles and" to make it fit):

I’m not quite sure about "across devices" – I added that to try and imply that it’ll work on mobile/tablets/desktop/etc, but in fewer words. Is there a better way to say this?

[sarawilcox]

I think "across devices" may be the shortest way of saying it. Otherwise we might have to add more words, e.g. "across different devices". Maybe leave it as it is?