docs: use sapper/cypress for e2e testing

docs/src/routes/components/[slug].svelte

@@ -0,0 +1,38 @@
+<script context="module">
+  export async function preload({ params }) {
+    const res = await this.fetch(`components/${params.slug}.json`);
+    const data = await res.json();
+
+    if (res.status === 200) {
+      return { data };
+    } else {
+      this.error(res.status, data.message);
+    }
+  }
+</script>
+
+<script>
+  export let data = {};
+
+  import { onMount } from "svelte";
+
+  let component = undefined;
+
+  onMount(async () => {
+    try {
+      component = await import(`../examples/${data.title}.svelte`);
+    } catch (e) {
+      console.log(e);
+    }
+  });
+</script>
+
+<svelte:head>
+  <title>{data.title}</title>
+</svelte:head>
+
+<h1>{data.title}</h1>
+
+{#if component}
+  <svelte:component this={component.default} />
+{/if}