contents/index: update sponsors

Author: hajimehoshi

contents/index.html

@@ -117,12 +117,6 @@ <h3>Silver</h3>
       <figcaption><a href="https://github.com/m110">Miłosz Smółka</a></figcaption>
     </figure>
   </div>
-  <div class="grid-item-1">
-    <figure>
-      <p class="img avatar"><a href="https://github.com/yottonoko"><img src="https://github.com/yottonoko.png?size=168" width="168"></a></p>
-      <figcaption><a href="https://github.com/yottonoko">yottonoko</a></figcaption>
-    </figure>
-  </div>
   <div class="grid-item-1">
     <figure>
       <p class="img avatar"><a href="https://github.com/HunterR0se"><img src="https://github.com/HunterR0se.png?size=168" width="168"></a></p>

contents/ja/index.html

@@ -117,12 +117,6 @@ <h3>シルバー</h3>
       <figcaption><a href="https://github.com/m110">Miłosz Smółka さん</a></figcaption>
     </figure>
   </div>
-  <div class="grid-item-1">
-    <figure>
-      <p class="img avatar"><a href="https://github.com/yottonoko"><img src="https://github.com/yottonoko.png?size=168" width="168"></a></p>
-      <figcaption><a href="https://github.com/yottonoko">yottonoko さん</a></figcaption>
-    </figure>
-  </div>
   <div class="grid-item-1">
     <figure>
       <p class="img avatar"><a href="https://github.com/HunterR0se"><img src="https://github.com/HunterR0se.png?size=168" width="168"></a></p>