fix: navigation on mobile v6

Author: nikhiltidke101

custom-implementation/src/main.tsx

@@ -20,7 +20,7 @@ const render = async () => {
   const theme = document.getElementsByTagName('html')[0].getAttribute('class')
 
   if (!document.getElementById('theme-switch')) {
-    if (document.querySelector('button.fern-search-bar') !== null) {
+    if (document.querySelector('button.fern-search-bar')) {
       const sidenav = document.querySelector('button.fern-search-bar')
         ?.parentElement as HTMLElement
       const wrapper = document.createElement('div')