drone: fix build for new image name

.drone.yml

@@ -5,7 +5,7 @@ pipeline:
       - sass --cache-location /tmp assets/css/main.scss:assets/css/main.css
 
   content:
-    image: images.abackstrom.com/sixohthree
+    image: images.abackstrom.com/pelican
     commands:
       - pelican content -o output -s publishconf.py