Remove Zuplo sponsor banner

Author: raphael

README.md

@@ -72,24 +72,6 @@ promoting reuse and standardization across services.
 # Sponsors
 
 <table width="100%">
-    <tr>
-        <td>
-            <img width="1000" height="0" />
-            <a href="https://zuplo.link/goa-web">
-            <picture>
-                <source media="(prefers-color-scheme: dark)" srcset="docs/zuplo-dark.png">
-                <img src="docs/zuplo.png" alt="Zuplo" width="260" align="right">
-            </picture>
-            </a>
-            <h3>Zuplo: Scale, Protect, and Productize your Goa API</h3>
-            <p>
-                Our API Gateway allows you to secure your API, scale it
-                globally, generate documentation from your OpenAPI, and add
-                monetization.
-            </p>
-            <a href="https://zuplo.link/goa-web">Start for Free</a>
-        </td>
-    </tr>
     <tr>
         <td>
             <img width="1000" height="0" />