Fix sponsor in docs theme

Author: vsalvino

docs/_templates/sponsor.html

@@ -1,8 +1,7 @@
-<a class="card mt-5" href="https://www.coderedcorp.com/"
-   style="font-size:0.9em; line-height: 1.2em; max-width: 275px; text-decoration:none;">
+<a class="d-block border rounded p-1 mt-5" href="https://www.coderedcorp.com/" style="font-size:0.9em; line-height:1.2em; text-decoration:none;">
   <div class="row no-gutters">
     <div class="col-3">
-      <img src="https://docs.coderedcorp.com/logo-square-red-128.png" class="w-100" alt=""/>
+      <img src="https://docs.coderedcorp.com/logo-square-red-128.png" class="w-100 rounded" alt=""/>
     </div>
     <div class="col-9">
       <p class="p-2 m-0">