Update Khoj tagline to "Your Second Brain"

src/interface/web/app/layout.tsx

@@ -6,7 +6,7 @@ const inter = Noto_Sans({ subsets: ["latin"] });
 
 export const metadata: Metadata = {
     title: "Khoj AI - Home",
-    description: "Your open, personal AI.",
+    description: "Your Second Brain.",
     icons: {
         icon: '/static/favicon.ico',
     },

src/interface/web/app/page.tsx

@@ -154,7 +154,7 @@ function ChatBodyData(props: ChatBodyDataProps) {
                 showLoginPrompt && (
                     <LoginPrompt
                         onOpenChange={setShowLoginPrompt}
-                        loginRedirectMessage={"Login to start extending your second brain"} />
+                        loginRedirectMessage={"Login to your second brain"} />
                 )
             }
             <div className={`w-full text-center justify-end content-end`}>