Replace sponsors image with a non-year image

templates/sponsors/sponsor.html

@@ -5,8 +5,8 @@
 
 <h2>Sponsor Electromagnetic Field</h2>
 
-    <img src="{{ url_for('static', filename='images/sponsor/sponsor_1.jpg')}}"
-            title="EMF 2022, Kari Bellamy" class="img-thumbnail img-responsive" style="float:right; width:320px; margin-left: 16px;">
+    <img src="{{ static_url_for('static', filename='images/main_images/004.jpg') }}"
+            title="EMF 2018" class="img-thumbnail img-responsive" style="float:right; width:280px; margin-left: 16px;">
 <p>Electromagnetic Field (EMF) is the UK’s largest technology-focused camping festival: a three-day event for people with an inquisitive mind and an interest in science, engineering, arts, technology, crafts, games, DIY, or security.</p>
 
 <p>Held every two years, EMF is a cross between a conference and a festival, with talks and workshops on a wide range of subjects. EMF is a non-profit event, entirely run by a dedicated team of volunteers.</p>