Update Run-Kit example

[JRJurman]

Summary

Underscore has a cool default example... we should try to have something similar!
https://npm.runkit.com/underscore

[JRJurman]

A simple example like below should work:

var {registerHtml} = require("tram-one")

const html = registerHtml()
const element = html`<button>Hello World</button>`
element.outerHTML

More complex examples (with start) will require #149 to be resolved