FIX: Prevent jumping on scroll (#33)

We previously added a reset to the topic body to fix some wrapping
issues, but looks like a) the reset is no longer necessary and b) it
causes jumping on scroll. So let's remove it.

common/common.scss

@@ -181,10 +181,6 @@ a.d-toc-close {
   .container.posts .topic-navigation.with-topic-progress {
     align-self: start;
   }
-
-  #post_1 .topic-body {
-    float: none;
-  }
 }
 
 // core sets first child's top margin to 0