Make categories universal

docs/sphinxext/mantiddoc/directives/categories.py

@@ -348,18 +348,12 @@ def create_category_pages(app):
         # Now any additional index pages if required
         if category.name in INDEX_CATEGORIES:
             # index in categories directory
-            if category.name == 'Concepts':
-                category_html_dir = 'concepts/categories'
-            else:
-                category_html_dir = os.path.dirname(category.html_path)
+            category_html_dir = os.path.join(category.name.lower(), 'categories')
             category_html_path_noext = os.path.join(category_html_dir, 'index')
             yield (category_html_path_noext, context, template)
 
             # index in document directory
-            if category.name == 'Concepts':
-                document_dir = 'concepts'
-            else:
-                document_dir = os.path.dirname(category_html_dir)
+            document_dir = os.path.dirname(category_html_dir)
             category_html_path_noext = os.path.join(document_dir, 'index')
             context['outpath'] = category_html_path_noext + '.html'
             yield (category_html_path_noext, context, template)