Docs update

[davestewart]

Hey,

Getting to know the library and the docs, I think they could do with a bit of a refresh:

• clearer heading structure
• perhaps a new section on models
• disambiguating some examples
• a little better English

I've written a lot of docs in my time, e.g.:

• https://github.com/davestewart/axios-actions/tree/master/docs
• https://davestewart.github.io/vuex-pathify
• https://github.com/kutlugsahin/vue-smooth-dnd/ (I rewrote these for @kutlugsahin)

Want me to take a look?

[deblockt]

Yes I would be very happy if you would look at the documentation