Add train detail icons with tooltips

src/lib/navigation/nav.svelte

@@ -20,6 +20,7 @@
 </script>
 
 <footer>
+  
   {#each links as item}
     <a href={item.path} class:active={$page.url.pathname == item.path}>
       <img src={item.svgPath} alt={item.title} />