Shift emojis and icons styles into framework

app/assets/stylesheets/framework.scss

@@ -44,3 +44,5 @@
 @import "framework/awards.scss";
 @import "framework/images.scss";
 @import "framework/broadcast-messages";
+@import "framework/emojis.scss";
+@import "framework/icons.scss";

app/assets/stylesheets/pages/explore.scss

-.explore-title {
-  text-align: center;
-
-  h3 {
-    font-weight: normal;
-    font-size: 30px;
-  }
-}

app/views/explore/_head.html.haml

-.explore-title
-  %h3
+.explore-title.text-center
+  %h2
     Explore GitLab
   %p.lead
     Discover projects, groups and snippets. Share your projects with others