docs: add /guides/.../welcome route redirect -> /quick-start

src/routes/guides/tutorials/getting-started-with-solid/welcome.tsx

@@ -0,0 +1,37 @@
+import { onMount } from "solid-js";
+
+/**
+ * Server redirect. Immediate HTTP redirect for requests handled on the server.
+ * 301 for permanent. 301s may be cached by browsers/CDNs.
+ */
+export function GET() {
+  return new Response(null, {
+    status: 302,
+    headers: { Location: "/quick-start" },
+  });
+}
+/**
+ * Client fallback: for environments where GET isn't invoked the client will
+ * execute this and replace the location. Keeps UX smooth when navigating client-side.
+ */
+export default function WelcomeRedirect() {
+  onMount(() => {
+    // use replace so the redirect doesn't add an extra history entry
+    try {
+      window.location.replace("https://docs.solidjs.com/quick-start");
+    } catch {
+      // fallback: set href
+      window.location.href = "https://docs.solidjs.com/quick-start";
+    }
+  });
+
+  return (
+    <main style={{ "font-family": "system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif", padding: "2rem" }}>
+      <h1>Redirecting…</h1>
+      <p>
+        You are being redirected to the Quick Start page. If the redirect does not happen automatically,{" "}
+        <a href="https://docs.solidjs.com/quick-start">click here to continue</a>.
+      </p>
+    </main>
+  );
+}