removed css style from config

the style for the wiki calendar is applied in the farmconfig for all
wikis.

{{cookiecutter.directory_name}}/{{cookiecutter.directory_name}}.py

@@ -32,6 +32,3 @@ class Config(FarmConfig):
     acl_rights_default = u"{{cookiecutter.wiki_name}}Group:read,write,delete,revert All:"
 
     logo_string = u'<img src="/static/logo-{{cookiecutter.directory_name}}.png" alt="Logo">'
-
-    # style the "today" calendar cell
-    html_head = u'<style>table td.cal-today{border:3pt solid #0af;}</style>'