docs: remove banner rotator (#4235)

## Description

The rotator was hardcoded in the repo, so every banner or link change
needed a docs PR and deploy. We plan to replace it soon with a dynamic
top banner whose image and link come from our delivery server, allowing
marketing to swap banners without touching this repository.

This PR removes the static TopPromoRotator promo banner from the
documentation site. Drops the component, its styles, HandIcon, and all
Navbar wiring (including localStorage dismiss logic).

---------

Co-authored-by: Michał Bert <63123542+m-bert@users.noreply.github.com>

Author: p-malecki

packages/docs-gesture-handler/src/components/HandIcon/index.tsx

@@ -1,48 +1,8 @@
 import React from 'react';
 import useBaseUrl from '@docusaurus/useBaseUrl';
-import { useLocation } from '@docusaurus/router';
 import { Navbar } from '@swmansion/t-rex-ui';
-import TopPromoRotator, {
-  PROMO_VERSION,
-} from '@site/src/components/TopPromoRotator';
 
 export default function NavbarWrapper(props) {
-  const location = useLocation();
-  const baseUrl = useBaseUrl('/');
-  const isLanding = location.pathname === baseUrl;
-
-  const [showPromo, setShowPromo] = React.useState(true);
-
-  React.useEffect(() => {
-    if (isLanding || typeof globalThis === 'undefined') {
-      return;
-    }
-
-    try {
-      const raw = globalThis.localStorage?.getItem('topPromoState');
-      const state = raw ? JSON.parse(raw) : null;
-      if (state?.v === PROMO_VERSION && state?.hidden) {
-        setShowPromo(false);
-      }
-    } catch (_) {
-      // ignore
-    }
-  }, [isLanding]);
-
-  const handleClosePromo = React.useCallback(() => {
-    setShowPromo(false);
-    if (typeof globalThis !== 'undefined') {
-      try {
-        globalThis.localStorage?.setItem(
-          'topPromoState',
-          JSON.stringify({ v: PROMO_VERSION, hidden: true })
-        );
-      } catch {
-        // ignore
-      }
-    }
-  }, []);
-
   const titleImages = {
     light: useBaseUrl('/img/title.svg'),
     dark: useBaseUrl('/img/title-dark.svg'),
@@ -51,15 +11,7 @@ export default function NavbarWrapper(props) {
   const heroImages = {
     logo: useBaseUrl('/img/logo-hero.svg'),
   };
-
   return (
-    <div style={{ display: 'flex', flexDirection: 'column', flexShrink: 0 }}>
-      {isLanding ? (
-        <TopPromoRotator />
-      ) : (
-        showPromo && <TopPromoRotator onClose={handleClosePromo} />
-      )}
-      <Navbar heroImages={heroImages} titleImages={titleImages} {...props} />
-    </div>
+    <Navbar heroImages={heroImages} titleImages={titleImages} {...props} />
   );
 }