refactor: rename the javascript files to main (#268)

Author: engineervix

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/static/js/{{cookiecutter.project_slug}}.js renamed to {{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/static/js/main.js

@@ -131,7 +131,7 @@
     {% compress js %}
 {% endraw %}
     <!-- Custom Scripts -->
-    {% raw %}<script src="{% static {% endraw %}'js/{{ cookiecutter.project_slug }}.min.js' {% raw %}%}"></script>{% endraw %}
+    {% raw %}<script src="{% static {% endraw %}'js/main.min.js' {% raw %}%}"></script>{% endraw %}
 {% raw %}
     {% endcompress %}