Use the new shadcn sidebar for khoj nav and actions

- Use the sidebar across all pages to quickly navigate through the app, access settings, and go to past chats
- Pending: mobile friendliness

src/interface/web/app/layout.tsx

@@ -3,6 +3,9 @@ import { noto_sans, noto_sans_arabic } from "@/app/fonts";
 import "./globals.css";
 import { ContentSecurityPolicy } from "./common/layoutHelper";
 
+import { SidebarProvider, SidebarTrigger } from "@/components/ui/sidebar";
+import { AppSidebar } from "@/app/components/appSidebar/appSidebar";
+
 export const metadata: Metadata = {
     title: "Khoj AI - Ask Anything",
     description: