chore: remove vercel link form github pages

Author: sy-records

docs/index.html

@@ -195,8 +195,7 @@
                 editHtml +
                 html +
                 '\n\n----\n\n' +
-                '<a href="https://docsify.js.org" target="_blank" style="color: inherit; font-weight: normal; text-decoration: none;">Powered by docsify</a>\n\n' +
-                '<a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank"><img src="/_media/powered-by-vercel.svg" alt="Vercel" width="150"></a>'
+                '<a href="https://docsify.js.org" target="_blank" style="color: inherit; font-weight: normal; text-decoration: none;">Powered by docsify</a>'
               );
             })
           },