[examples] Update to latest SolidStart (#11308)

We've done a pretty significant update over the past few months on
SolidStart and 1.0 is looming. Thought I'd update the official templates
to get in line before we do the release.

I wasn't sure what to do with the `output` fields as we use Vercel's
build output V3 here. But otherwise I think everything should be good.

---------

Co-authored-by: Nathan Rajlich <n@n8.io>
Co-authored-by: Jeff See <jeffsee.55@gmail.com>

examples/solidstart-1/src/entry-client.tsx

@@ -0,0 +1,4 @@
+// @refresh reload
+import { mount, StartClient } from "@solidjs/start/client";
+
+mount(() => <StartClient />, document.getElementById("app")!);