Remove partialCached for now because I'm worried of it causing issues

It didn't last very long. Speed isn't really a concern currently since
my sites all generate in ~50ms (on my computer, at least).

layouts/_default/_markup/render-heading.html

@@ -2,7 +2,7 @@
     {{ .Text | safeHTML }}
     <a href="#{{ .Anchor | safeURL }}">
         <span class="section-header-link">
-            {{ partialCached "icon.html" "link" "link" }}
+            {{ partial "icon.html" "link" }}
         </span>
     </a>
 </h{{ .Level }}>