fix(website): point web app CTAs at the Docker self-hosting docs

The hosted PWA at iptvnator.vercel.app is paused because the free plan's
bandwidth quota is exhausted, so both "web app" CTAs led to a dead page.
Link them to docker/README.md and reword them around self-hosting.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/website/src/components/DownloadCTA.astro

@@ -88,15 +88,15 @@ const packageManagers = [
       }
     </div>
 
-    <!-- Web app link -->
+    <!-- Self-hosted web app link -->
     <div class="mt-10 text-center">
       <p class="text-sm text-surface-500">
-        Or use it directly at{' '}
+        Prefer the browser version?{' '}
         <a
-          href="https://iptvnator.vercel.app"
+          href="https://github.com/4gray/iptvnator/blob/master/docker/README.md"
           class="text-accent-400 underline decoration-accent-500/30 underline-offset-4 transition-colors hover:text-accent-300 hover:decoration-accent-400/50"
         >
-          iptvnator.vercel.app
+          Self-host it with Docker
         </a>
       </p>
     </div>

apps/website/src/components/Hero.astro

@@ -97,15 +97,15 @@ const heroSocialLinks = [
           </span>
         </a>
 
-        <!-- Secondary: Web app link -->
+        <!-- Secondary: self-hosted web app link -->
         <a
-          href="https://iptvnator.vercel.app"
+          href="https://github.com/4gray/iptvnator/blob/master/docker/README.md"
           class="group inline-flex items-center gap-2.5 rounded-lg border border-dashed border-surface-600/60 px-7 py-3.5 text-sm font-medium text-surface-400 transition-all duration-300 hover:border-accent-500/30 hover:text-accent-400"
         >
           <svg class="h-4 w-4 transition-colors" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5">
             <path stroke-linecap="round" stroke-linejoin="round" d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9" />
           </svg>
-          Or try the Web App
+          Or self-host the Web App
           <svg class="h-3.5 w-3.5 transition-transform duration-200 group-hover:translate-x-0.5" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
             <path stroke-linecap="round" stroke-linejoin="round" d="M17 8l4 4m0 0l-4 4m4-4H3" />
           </svg>