Add various ad placements throughout the website to monetize content

Integrates AdSense for ads on the homepage, article pages, and video pages, including in-feed ads styled as article cards.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 413891e8-d784-4bea-b9f5-91a5a68316b4
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: b587b746-f67b-4539-9958-86999aee56de
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/413891e8-d784-4bea-b9f5-91a5a68316b4/igVW4lQ
Replit-Helium-Checkpoint-Created: true

client/src/pages/article.tsx

@@ -8,6 +8,7 @@ import { Button } from "@/components/ui/button";
 import { Skeleton } from "@/components/ui/skeleton";
 import Header from "@/components/header";
 import Footer from "@/components/footer";
+import { InArticleAd } from "@/components/adsense";
 import DOMPurify from "dompurify";
 import { useEffect } from "react";
 
@@ -214,6 +215,8 @@ export default function ArticlePage() {
           data-testid="article-content"
         />
 
+        <InArticleAd />
+
         <RelatedArticles currentSlug={slug || ""} />
       </main>
       <Footer />