feat: readded google signins and add global announcement feature

- Updated .env.example to include new environment variables for Google authentication and global announcement settings.
- Integrated Google sign-in functionality in SignInButton and HeroSection components, allowing users to log in with their Google accounts.
- Added GlobalAnnouncement component to display maintenance notices or announcements on the homepage layout.
- Enhanced styling for Google sign-in buttons to improve user experience.

surfsense_web/app/(home)/layout.tsx

@@ -2,6 +2,7 @@
 
 import { usePathname } from "next/navigation";
 import { FooterNew } from "@/components/homepage/footer-new";
+import { GlobalAnnouncement } from "@/components/homepage/global-announcement";
 import { Navbar } from "@/components/homepage/navbar";
 
 export default function HomePageLayout({ children }: { children: React.ReactNode }) {
@@ -15,6 +16,7 @@ export default function HomePageLayout({ children }: { children: React.ReactNode
 
 	return (
 		<main className="min-h-screen bg-linear-to-b from-gray-50 to-gray-100 text-gray-900 dark:from-black dark:to-gray-900 dark:text-white overflow-x-hidden">
+			<GlobalAnnouncement />
 			<Navbar />
 			{children}
 			{!isAuthPage && <FooterNew />}