Remove Node_modules as not needed vendored

also changed few Things about Website

website/_site/download/index.html

@@ -17,7 +17,7 @@
   <meta name="twitter:title" content="Download KST4Contest">
   <meta name="twitter:description" content="Download KST4Contest releases for Windows, Linux and macOS.">
 
-  <link rel="stylesheet" href="/assets/css/main.css?v=1783381592602">
+  <link rel="stylesheet" href="/assets/css/main.css?v=1783425387839">
   <link rel="alternate" type="application/rss+xml" title="KST4Contest News" href="/feed.xml">
 
 <meta property="og:image" content="https://kst4contest.hamradioonline.de/assets/social/kst4contest-og.png">
@@ -57,7 +57,7 @@
       
         <a href="/faq/">FAQ</a>
       
-      <a class="nav-cta" href="https://github.com/praktimarc/kst4contest/releases/latest">Download</a>
+      <a class="nav-cta" href="/download/">Download</a>
     </nav>
   </header>
 
@@ -105,6 +105,18 @@
           <p class="badge">Recommended</p>
         
 
+        <h3>Linux</h3>
+        <p><strong>Flatpak (.flatpakref)</strong></p>
+        <p>Recommended for most Linux users. Open the file with GNOME Software / Discover, or run: flatpak install de.x08.KST4Contest.flatpakref</p>
+
+        <a class="button secondary" href="https://github.com/praktimarc/kst4contest/releases/download/v1.41.0/de.x08.KST4Contest.flatpakref">Download →</a>
+      </article>
+    
+      <article class="card download-card">
+        <div class="feature-icon">🐧</div>
+
+        
+
         <h3>Linux</h3>
         <p><strong>AppImage x86_64</strong></p>
         <p>Portable Linux build without package installation.</p>
@@ -204,8 +216,9 @@
     <p class="eyebrow">Not sure?</p>
     <h2>Which file should I use?</h2>
     <p>
-      Windows users usually want the ZIP package. Linux users can start with the AppImage,
-      or install a native DEB/RPM package if preferred. The PDF manuals are attached to the same GitHub release.
+      Windows users usually want the ZIP package. Linux users are best served by the Flatpak,
+      which auto-updates and works across distributions; the AppImage or a native DEB/RPM/Arch
+      package are alternatives if preferred. The PDF manuals are attached to the same GitHub release.
     </p>
     <div class="actions">
       <a class="button" href="/manual/en/installation/">Installation guide</a>