feat(website): add Gold Sponsors icons

README.md

@@ -33,7 +33,13 @@ Open Collectiveでの支援には、サイト上にロゴを表示するとい
 
 - [JavaScript Primer - Open Collective](https://opencollective.com/jsprimer)
 
-[![jsprimer backers](https://opencollective.com/jsprimer/backers.svg?width=890)](https://opencollective.com/jsprimer#backers)
+**Gold Sponsors**
+
+[![jsprimer sponsors](https://opencollective.com/jsprimer/sponsors.svg?width=890&avatarHeight=80)](https://opencollective.com/jsprimer#sponsors)
+
+**Supporters**
+
+[![jsprimer backers](https://opencollective.com/jsprimer/backers.svg?width=890&avatarHeight=40)](https://opencollective.com/jsprimer#backers)
 
 
 また、書籍版へのレビューを書くことも支援に繋がります。

source/landing/index.html

@@ -67,12 +67,9 @@ <h3 class="mg-sm">
             </p>
             <p class="mg-sm">
                 <h3>Gold Sponsors</h3>
-                <a href="https://opencollective.com/jsprimer#sponsor">
-                    <img src="https://opencollective.com/jsprimer/sponsor.svg?width=890" alt="jsprimer sponsors" />
-                </a>
+                <a href="https://kokuchou.net/" title="株式会社コクチョウ"><img src="https://images.opencollective.com/kokuchou/4241e96/logo/256.png?height=166" height="166" alt="" loading="lazy"></a>
                 <h4>Supporters</h4>
-                <a href="https://opencollective.com/jsprimer#backers">
-                    <img src="https://opencollective.com/jsprimer/backers.svg?width=890" alt="jsprimer backers" />
+                <a href="https://opencollective.com/jsprimer"><img src="https://opencollective.com/jsprimer/backers.svg?avatarHeight=88&width=890" alt="jsprimer backers" loading="lazy"/>
                 </a>
             </p>
             <form action="https://github.us13.list-manage.com/subscribe/post?u=fc41e11a2b9dc6f05350e0de0&amp;id=7ab1594ae8"