remove JetBrains from sponsors

Author: johan12345

_includes/sponsors.html

@@ -8,11 +8,4 @@ <h2>{% t sponsors %}</h2>
         <p>{% t sponsor_jawg %}</p>
     </div>
 
-    <div class="sponsor">
-        <a href="https://www.jetbrains.com/community/opensource/"><img
-                src="{{ '/assets/jetbrains.svg' | relative_url }}"
-                alt="JetBrains" height="48"/></a>
-        <p>{% t sponsor_jetbrains %}</p>
-    </div>
-
 </div>