Mention in documentation that theme.css is loaded by default

docs/custom.md

@@ -60,7 +60,9 @@ we'll customize also the CSS:
 
     mv mylogo.png /srv/umap/custom/static/umap/mylogo.png
 
-And then let's add some custom rules, for example the one to load our logo:
+And then let's add some custom rules in `theme.css`. This file will be automatically loaded by uMap.
+
+For example, this rule to load our logo:
 
 ```css
 .umap-nav h1 a {

umap/settings/__init__.py

@@ -43,6 +43,5 @@ else:
                 globals()['TEMPLATES'][0]['DIRS'].insert(0, value)
             elif key == 'UMAP_CUSTOM_STATICS':
                 globals()['STATICFILES_DIRS'].insert(0, value)
-                print(globals()['STATICFILES_DIRS'])
             else:
                 globals()[key] = value