Set ASSETH_PATH for theme assets

Related to:
https://github.com/plusjade/jekyll-bootstrap/issues/290
diff --git a/site/_config.yml b/site/_config.yml
index 934f923..e013680 100644
--- a/site/_config.yml
+++ b/site/_config.yml
@@ -34,6 +34,7 @@
 
 # if 'analytics_on' is true, analytics section will be rendered on the HTML pages
 JB:
+  ASSET_PATH: "/assets/themes/apache-clean"
   analytics:
     provider: google_universal
     google_universal: