contents/index: update sponsors

Author: hajimehoshi

contents/index.html

@@ -129,6 +129,12 @@ <h3>Silver</h3>
       <figcaption><a href="https://github.com/HunterR0se">Hunter Rose</a></figcaption>
     </figure>
   </div>
+  <div class="grid-item-1">
+    <figure>
+      <p class="img avatar"><a href="https://github.com/nathany"><img src="https://github.com/nathany.png?size=168" width="168"></a></p>
+      <figcaption><a href="https://github.com/nathany">Nathan Youngman</a></figcaption>
+    </figure>
+  </div>
 </div>
 <p class="img" style="justify-content: start;">
   <iframe src="https://github.com/sponsors/hajimehoshi/button" title="Sponsor hajimehoshi" height="35" width="116" style="border: 0;"></iframe>

contents/ja/index.html

@@ -129,6 +129,12 @@ <h3>シルバー</h3>
       <figcaption><a href="https://github.com/HunterR0se">Hunter Rose さん</a></figcaption>
     </figure>
   </div>
+  <div class="grid-item-1">
+    <figure>
+      <p class="img avatar"><a href="https://github.com/nathany"><img src="https://github.com/nathany.png?size=168" width="168"></a></p>
+      <figcaption><a href="https://github.com/nathany">Nathan Youngman さん</a></figcaption>
+    </figure>
+  </div>
 </div>
 <p class="img" style="justify-content: start;">
   <iframe src="https://github.com/sponsors/hajimehoshi/button" title="Sponsor hajimehoshi" height="35" width="116" style="border: 0;"></iframe>