Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/apache2/templates/default/charset.conf.erb

@@ -1,6 +0,0 @@
-# Read the documentation before enabling AddDefaultCharset.
-# In general, it is only a good idea if you know that all your files
-# have this encoding. It will override any encoding given in the files
-# in meta http-equiv or xml encoding tags.
-
-#AddDefaultCharset UTF-8