Add initial gallery page

Former-commit-id: 251ae36ff3eb6f9333d319890963c87c3a115b03

app/docusaurus.config.js

@@ -56,6 +56,7 @@ const config = {
             position: "right",
             label: "Ismertetők",
           },
+          { to: "/gallery", label: "Galéria", position: "right" },
           { to: "/support", label: "Support", position: "right" },
           { to: "/contact", label: "Elérhetőségek", position: "right" },
         ],

app/src/pages/gallery.js

+import React from "react";
+import clsx from "clsx";
+import Layout from "@theme/Layout";
+import Link from "@docusaurus/Link";
+import useDocusaurusContext from "@docusaurus/useDocusaurusContext";
+import styles from "./index.module.css";
+import HomepageFeatures from "../components/HomepageFeatures";
+
+export default function Gallery() {
+  const { siteConfig } = useDocusaurusContext();
+  return (
+    <Layout
+      title={`${siteConfig.title}`}
+      description="A Kollégiumi Számítástechnikai Kör weboldala"
+    >
+      <main
+        class="d-flex justify-content-center align-items-center flex-column"
+        style={{ height: "120px" }}
+      >
+        <h3>Hamarosan 👷</h3>
+      </main>
+    </Layout>
+  );
+}