Change from Mkdocs to slates

docs/lib/unique_head.rb

@@ -0,0 +1,24 @@
+# Unique header generation
+require 'middleman-core/renderers/redcarpet'
+require 'digest'
+class UniqueHeadCounter < Middleman::Renderers::MiddlemanRedcarpetHTML
+  def initialize
+    super
+    @head_count = {}
+  end
+  def header(text, header_level)
+    friendly_text = text.gsub(/<[^>]*>/,"").parameterize
+    if friendly_text.strip.length == 0
+      # Looks like parameterize removed the whole thing! It removes many unicode
+      # characters like Chinese and Russian. To get a unique URL, let's just
+      # URI escape the whole header
+      friendly_text = Digest::SHA1.hexdigest(text)[0,10]
+    end
+    @head_count[friendly_text] ||= 0
+    @head_count[friendly_text] += 1
+    if @head_count[friendly_text] > 1
+      friendly_text += "-#{@head_count[friendly_text]}"
+    end
+    return "<h#{header_level} id='#{friendly_text}'>#{text}</h#{header_level}>"
+  end
+end