client/web: copy existing UI to basic react components

This copies the existing go template frontend into very crude react
components that will be driven by a simple JSON api for fetching and
updating data.  For now, this returns a static set of test data.

This just implements the simple existing UI, so I've put these all in a
"legacy" component, with the expectation that we will rebuild this with
more properly defined components, some pulled from corp.

Updates tailscale/corp#13775

Signed-off-by: Will Norris <will@tailscale.com>

client/web/src/components/app.tsx

@@ -1,5 +1,18 @@
 import React from "react"
+import { Footer, Header, IP, State } from "src/components/legacy"
+import useNodeData from "src/hooks/node-data"
 
 export default function App() {
-  return <div className="text-center">Hello world</div>
+  const data = useNodeData()
+
+  return (
+    <div className="py-14">
+      <main className="container max-w-lg mx-auto mb-8 py-6 px-8 bg-white rounded-md shadow-2xl">
+        <Header data={data} />
+        <IP data={data} />
+        <State data={data} />
+      </main>
+      <Footer data={data} />
+    </div>
+  )
 }