Update the contributor doc website link

Author: Qianqianye

src/templates/pages/index.hbs

@@ -39,7 +39,7 @@ slug: /
       <ul aria-labelledby="involvement-options" class="list_view bullets">
         <li><a href="{{root}}/teach">{{#i18n "p4xp4"}}{{/i18n}}</a></li>
         <li><a href="https://day.processing.org" target="_blank">{{#i18n "p4xp5"}}{{/i18n}}</a></li>
-        <li><a href="https://github.com/processing/p5.js/tree/main/contributor_docs"
+        <li><a href="https://p5js.org/contributor-docs/#/"
             target="_blank">{{#i18n "p4xp6"}}{{/i18n}}</a></li>
       </ul>