Updated alt text to adhere to WCAG (#2982)

pages/donate.html

@@ -15,13 +15,13 @@ <h1>Donate to Hack for LA</h1>
         practices, and code with the larger civic tech community.
       </p>
     </div>
-    <img class="donate-banner-icon" src="/assets/images/donate/solidarity-pana.svg" alt="donate banner icon" />
+    <img class="donate-banner-icon" src="/assets/images/donate/solidarity-pana.svg" alt="" />
   </div>
 
   <div class="content-section donate-card-container">
     <div class="page-card card-primary page-card-lg page-card--donate">
       <h1>Help Us Keep The Lights On</h1>
-      <img id="donate-donation-icon" class='donate-card-img' src="/assets/images/donate/help-us-icon.svg" alt="donate card image" />
+      <img id="donate-donation-icon" class='donate-card-img' src="/assets/images/donate/help-us-icon.svg" alt="" />
       <div class="donate-card-body">
         <h2>Running Hack for LA costs money</h2>
         <p>
@@ -31,7 +31,7 @@ <h2>Running Hack for LA costs money</h2>
           world-class training to our members and valuable, scalable, impactful
           products to the community.
         </p>
-        <img class="donate-donation-png" src="/assets/images/donate/donation-chart.svg" alt="donation chart" />
+        <img class="donate-donation-png" src="/assets/images/donate/donation-chart.svg" alt="Hosting, mailing list services, Zoom accounts, domain names, stickers, t-shirts" />
         <h2>How to help us continue to do impactful work</h2>
         <ul>
           <li>
@@ -42,7 +42,7 @@ <h2>How to help us continue to do impactful work</h2>
         </ul>
       </div>
       <div class="donate-donation">
-        <img class="donate-donation-png" src="/assets/images/about/hfla-donate.gif" alt="donation form image" />
+        <img class="donate-donation-png" src="/assets/images/about/hfla-donate.gif" alt="Gif showing how to select Hack for LA from donation list" />
         <div class="donate-donation-body">
           <h2>Make a donation to Hack for LA</h2>
           <ol>