Improve category handling. Remove top-bar navigation for now (may bring it back later, in a more customized fashion)

_plugins/category_page.rb

@@ -1,15 +1,15 @@
 class CategoryPage < Jekyll::Page
-  def initialize(site, base, dir, category)
+  def initialize(site, base, category)
     @site = site
     @base = base
-    @dir = dir
+    @dir = category
     @name = 'index.html'
     
     self.process(@name)
     self.read_yaml(File.join(base, '_layouts'), 'category_index.html')
     self.data['category'] = category
 
-    category_title = site.config['category_titles'][category] || category.capitalize
+    category_title = site.config["category_titles"][category] || category.capitalize
     self.data['title'] = "#{category_title}"
   end
 end
@@ -23,7 +23,7 @@ class CategoryPageGenerator < Jekyll::Generator
     end
 
     site.categories.each_key do |category|
-      site.pages << CategoryPage.new(site, site.source, category, category)
+      site.pages << CategoryPage.new(site, site.source, category)
     end
   end