docs: use sapper/cypress for e2e testing

docs/src/components/GlobalHeader.svelte

@@ -0,0 +1,33 @@
+<script>
+  export let segment = undefined;
+
+  import {
+    SkipToContent,
+    Header,
+    HeaderNav,
+    HeaderNavItem,
+    HeaderUtilities,
+    HeaderActionLink
+  } from "carbon-components-svelte";
+</script>
+
+<Header
+  company="Carbon"
+  platformName="Components Svelte"
+  href="."
+  rel="prefetch"
+  aria-current={segment === undefined ? 'page' : undefined}>
+  <SkipToContent />
+  <HeaderNav>
+    <HeaderNavItem
+      rel="prefetch"
+      href="about"
+      text="About"
+      aria-current={segment === 'about' ? 'page' : undefined} />
+    <HeaderNavItem
+      rel="prefetch"
+      href="components"
+      text="Components"
+      aria-current={segment === 'components' ? 'page' : undefined} />
+  </HeaderNav>
+</Header>