removed Code for America alt text on about us page (#6025)

_includes/about-page/about-card-sponsors.html

@@ -1,7 +1,7 @@
 <div class="card-primary page-card-lg page-card--about">
     <div class="about-us-section-header" data-hash="sponsors"><span class="sec-head-img"><img
                 src="/assets/images/about/section-header-elements/sponsors.svg"
-                alt="Make your donation for Hack for LA Brigade on codeforamerica.org/donate. Choose the amount and select the payment frequency, then enter 'Hack for LA' under 'if your donation is for a Brigade, please select the Brigade Name(Optional)'."></span>Sponsors
+                alt=""></span>Sponsors
     </div>
     <div class="about-us-section-content">
         <div class="flex-container-row flex-container-row--partners">