markdown todo-list style

public/css/theme/includes/markdown.less

@@ -294,4 +294,9 @@ textarea#wmd-input {
     border: 2px rgba(101, 189, 119, 0.8) solid !important;
     background-color: rgb(101, 189, 119, 0.9);
   }
+}
+
+// markdown todo list
+.m-todo-item {
+    list-style: none;
 }