Bring back header section

- Reintroduced the Header component at the top of the index page by adding import and rendering <Header /> above the hero section.

X-Lovable-Edit-ID: edt-c7dba4c1-bc77-4551-923c-56dd2369810b

src/pages/Index.tsx

@@ -1,3 +1,4 @@
+import Header from "@/components/Header";
 import HeroSection from "@/components/HeroSection";
 import HeritageSection from "@/components/HeritageSection";
 import PlansSection from "@/components/PlansSection";
@@ -6,6 +7,7 @@ import Footer from "@/components/Footer";
 const Index = () => {
   return (
     <div className="bg-background text-foreground min-h-screen">
+      <Header />
       <HeroSection />
       <HeritageSection />
       <PlansSection />