docs: use sapper/cypress for e2e testing

docs/src/routes/components/index.svelte

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+<script context="module">
+  export function preload() {
+    return this.fetch("components.json")
+      .then(r => r.json())
+      .then(data => ({ data }));
+  }
+</script>
+
+<script>
+  export let data = [];
+
+  import { UnorderedList, ListItem, Link } from "carbon-components-svelte";
+</script>
+
+<svelte:head>
+  <title>Components</title>
+</svelte:head>
+
+<h1>Components</h1>
+
+<UnorderedList>
+  {#each data as data, i (data.title)}
+    <ListItem>
+      <Link rel="prefetch" href="components/{data.slug}">{data.title}</Link>
+    </ListItem>
+  {/each}
+</UnorderedList>