Fix static image

opendrift_leeway_webgui/leeway/templates/leeway/leewaysimulation_documentation.html

@@ -1,4 +1,5 @@
 {% extends "base.html" %}
+{% load static %}
 {% block content %}
     <h2>Leeway Simulation Documentation</h2>
     <h3>Background</h3>
@@ -154,7 +155,5 @@ <h3>Example</h3>
         When you reach that position, you need to define a course to the next largest cluster that at the same time covers as many drift positions as possible. You choose position 39° 29' N 18° 39' E as you next and final waypoint. To reach that last waypoint, you set course to 070.
     </p>
     <img src="{% static 'leeway/static/image/84eed031-ed5b-4802-a0e9-580b5fd9b93f.png' %}"
-         alt="Simulation result example"
-         width="1100"
-         height="803">
+         alt="Simulation result example">
 {% endblock content %}