Update trademark landing page (#4644)

.changeset/trademark-powered-by-url.md

@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Point the "Powered by GitBook" trademark link to gitbook.com/powered-by.

packages/gitbook/src/components/TableOfContents/Trademark.tsx

@@ -19,7 +19,7 @@ export async function Trademark(
     const { space } = context;
     const language = await getSpaceLanguage(context);
 
-    const url = new URL('https://www.gitbook.com');
+    const url = new URL('https://www.gitbook.com/powered-by');
     url.searchParams.set('utm_source', 'content');
     url.searchParams.set('utm_medium', 'trademark');
     url.searchParams.set('utm_campaign', space.id);