Add fundraiser banner

Author: Qianqianye

src/templates/partials/header.hbs

@@ -14,6 +14,6 @@ title: header
   <a tabindex="1" href="#content" id="skip-to-content">Skip to main content</a>
 
   {{!-- <a id="promo-link" href="https://github.com/processing/p5.js/wiki/p5.js-Contributor-Survey-2022" target="_blank"><div id="promo">Take the p5.js Contributor Survey by Dec 15, 2022!</div></a> --}}
-  {{!-- <a id="promo-link" href="https://donorbox.org/processingfoundation2021" target="_blank"><div id="promo">This season, we need your help! Click here to #SupportP5!</div></a> --}}
+ <a id="promo-link" href="https://donorbox.org/to-the-power-of-10" target="_blank"><div id="promo">Support p5.js and the Processing Foundation and earn unique rewards.🎉</div></a>
 
 </nav>