initial commit

dev/routes/(shell)/_404.tsx

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+import type { Component } from 'solid-js';
+import { SSButton, SSCallout, SSHeader, SSSurface } from 'src';
+import { IconShield } from '../../demo/content';
+
+const NotFoundPage: Component = () => (
+  <div class="demo_page">
+    <SSHeader title="Not found" subtitle="This route is not available in the demo." />
+    <SSSurface class="demo_surface">
+      <SSCallout color="amber" icon={<IconShield />}>
+        The page you requested does not exist. Head back to the overview to continue exploring.
+      </SSCallout>
+      <SSButton onclick={() => (window.location.href = '#/')}>Back to overview</SSButton>
+    </SSSurface>
+  </div>
+);
+
+export default NotFoundPage;