Added LMS Settings.

The `livecode_url` is now part of LMS settings and not hardcoded in the code.

community/www/courses/topic.html

@@ -67,13 +67,13 @@
 
 {%- block script %}
   {{ super() }}
-  <script type="text/javascript" src="http://livecode.dev.fossunited.org/static/livecode.js"></script>
+  <script type="text/javascript" src="{{ livecode_url }}/static/livecode.js"></script>
   <script type="text/javascript">
     $(function() {
       $(".canvas-editor").each((i, e) => {
         var editor = new LiveCodeEditor(e, {
           runtime: "python-canvas",
-          base_url: "http://livecode.dev.fossunited.org"
+          base_url: "{{ livecode_url }}"
         })
       })
     })