Remove Node_modules as not needed vendored

also changed few Things about Website

website/src/download/index.njk

@@ -47,8 +47,9 @@ description: Download KST4Contest releases for Windows, Linux and macOS.
     <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>