Fix profileMode imageUrl preloaded on every page (adityatelange#495)

Instead we now only preload on the home page.
Closes adityatelange#494

Signed-off-by: Daniel F. Dickinson <[email protected]>

Author: danielfdickinson

layouts/partials/head.html

@@ -59,7 +59,7 @@
 {{- end }}
 
 {{- with .Site.Params.profileMode }}
-{{- if and .enabled .imageUrl }}
+{{- if and .enabled .imageUrl $.IsHome }}
 <link rel="preload" href="{{ .imageUrl }}" as="image">
 {{- end }}
 {{- end }}