donate: remove UptimeRobot as they stopped sponsoring us

Author: anthraxx

sitestatic/uptimerobot_logo.png

@@ -74,14 +74,6 @@ <h3>Commercial sponsors and contributions</h3>
     <img src="{% static "shells_logo.png" %}"
     title="" alt="Shells logo"/></a>
 
-    <p>We would also like to thank <a href="https://uptimerobot.com/"
-    title="UptimeRobot">UptimeRobot</a> for providing their monitoring service to us.
-    UptimeRobot is a leading uptime monitoring service.</p>
-
-    <a href="https://uptimerobot.com/" title="UptimeRobot">
-    <img src="{% static "uptimerobot_logo.png" %}"
-    title="" alt="UptimeRobot logo"/></a>
-
     <h3>Past donors</h3>
 
     <p><a href="http://www.dotcom-monitor.com/" title="Dotcom-Monitor">Dotcom-Monitor</a> &amp; <a href="https://www.loadview-testing.com/" title="LoadView">LoadView</a></p>