Removed some redundant code

[turnerran]

Made some minor refactoring. Mainly the usage of optional changing for shorter syntax.

[what-the-diff]

PR Summary

• Update on BoosterChat Component
  Made changes in the BoosterChat.tsx file to improve search functionality and user interface. The component no longer checks whether the query is null before proceeding with the search, making the search functionality smoother. Also, the 'What is Booster Framework?' button has been removed, and the positioning of the remaining buttons has been improved for a cleaner interface.

• Optimization in Sidebar and Navbar Components
  Unused import statements have been removed and optional chaining operators have been added in CustomSidebarItem.jsx, DocSidebarItem/index.js, and NavbarNavLink.js files. This improves the efficiency of the code, making the sidebar and navigation components faster and smoother.

• Enhancement in Chat Feature of Navbar
  In the file CustomNavbarItem.tsx, similar to BoosterChat, the search functionality has been improved by removing the condition query === null. Also, a part of the chat feature has been enhanced by replacing one chat response component with another for better user interactions.

[ghost]

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[javiertoledo]

LGTM, thanks!!