add sane_lists to markdown extensions

this fixes stuff like

* foo
* bar

1. hax

incorporealcms/config.py

@@ -32,7 +32,7 @@ class Config(object):
         },
     }
 
-    MARKDOWN_EXTENSIONS = ['extra', 'mdx_linkify', 'smarty', 'tables']
+    MARKDOWN_EXTENSIONS = ['extra', 'mdx_linkify', 'sane_lists', 'smarty', 'tables']
     MARKDOWN_EXTENSION_CONFIGS = {
         'extra': {
             'attr_list': {},

incorporealcms/static/css/style.css

@@ -208,7 +208,11 @@ figcaption {
 }
 
 .footnote {
-    font-size: 0.75em;
+    font-size: 0.8em;
+}
+
+.footnote p {
+    margin: 0;
 }
 
 .footnote-ref:link, .footnote-ref:visited, .footnote-ref:hover, .footnote-ref:active {