Revert "Merge branch '27142-divider-in-readme-is-overlaying-with-image' into 'master'"

This reverts merge request !24181

app/assets/stylesheets/framework/typography.scss

@@ -102,7 +102,6 @@
     padding-bottom: 0.3em;
     border-bottom: 1px solid $white-dark;
     color: $gl-text-color;
-    overflow: hidden;
 
     &:first-child {
       margin-top: 0;
@@ -116,7 +115,6 @@
     padding-bottom: 0.3em;
     border-bottom: 1px solid $white-dark;
     color: $gl-text-color;
-    overflow: hidden;
   }
 
   h3 {

changelogs/unreleased/27142-divider-in-readme-is-overlaying-with-image.yml

----
-title: Do not draw heading borders over floated images in markdown
-merge_request:
-author: Gwen_
-type: fixed