safe guard for index page

Author: alexwolfe

public/docs/_includes/sidenav/_tertiary.jade

@@ -10,5 +10,6 @@ if tertiaryPath
       name = page.title
       selected =  current.path[5] == slug ? 'is-selected':''
 
-      li(class="#{selected}")<a  href="/docs/#{current.path[1]}/#{current.path[2]}/#{current.path[3]}/#{current.path[4]}/#{slug}.html" md-button>#{name}</a>
+      if slug != "index"
+        li(class="#{selected}")<a  href="/docs/#{current.path[1]}/#{current.path[2]}/#{current.path[3]}/#{current.path[4]}/#{slug}.html" md-button>#{name}</a>