add note to ebk links

public/selling.html

@@ -10,6 +10,7 @@
 <jl-header data-title="Artikel zum Verkauf"></jl-header>
 <div id="content">
     <jl-selling-table></jl-selling-table>
+    <small class="red">*Alle Links führen zu Ebay-kleinanzeigen.</small>
 </div>
 <jl-footer></jl-footer>
 <script src="/js/script.js"></script>