Add missing 'Skins animations' title

Author: remko

src/templates/docs/skins-pseudo/index.html

@@ -11,6 +11,7 @@
     <%= siteHeader %>
     <main class="bg-white black-70">
       <article class="bt b--black-10 pa3 ph5-ns">
+        <h3 class="f6 ttu tracked mt0">Skins animations</h3>
         <p class="measure f4 f3-ns lh-copy">
           You can use any color from the _colors.css file to style text and background colors for hover and focus states.
         </p>