refactor: remove unused sidenav code from main application

- Eliminated the unused sidenav code related to the search bar to enhance code clarity and maintainability.
- This change contributes to a cleaner rendering process in the main application.

Author: nikhiltidke101

custom-implementation/src/main.tsx

@@ -24,9 +24,6 @@ const render = async () => {
 
   const data = await getPageData()
 
-  const sidenav = document.querySelector('button.fern-search-bar')
-    ?.parentElement as HTMLElement
-
   const searchButton = document.querySelector('button.fern-search-button')
   const theme = document.getElementsByTagName('html')[0].getAttribute('class')