Add link, router, route, navaid-hash to index.js exports

[nafkhanzam]

So instead of importing like this:

<script>
  import Router from 'svelte-navaid/Router.svelte';
  import Route from 'svelte-navaid/Route.svelte';
  import Link from 'svelte-navaid/Link.svelte';
  import navaidHash from 'svelte-navaid/navaid-hash';
</script>

We can import it like this:

<script>
  import { Router, Route, Link, navaidHash } from "svelte-navaid";
</script>

[teckhan]

instead of "require(...)", do "require(...).default"

[jacwright]

This would require bundling the components into a packaged JavaScript file. This way they are bundled with your app, use your app's shared svelte code, and stay up-to-date with the latest Svelte release without needing this project to rebuild and re-release with each version of Svelte.

Thoughts?