Remove unused doc directory

doc/filter-toc

@@ -1,4 +0,0 @@
-#!/bin/bash
-# Render Markdown ToC with only headings appearing after "Table of Contents"
-dir="$(dirname "$0")"
-"$dir"/mdtoc "$1" | sed -n '/table-of-contents/,$p' | grep -v table-of-contents

doc/mdtoc

@@ -1,33 +0,0 @@
-#!/usr/bin/env ruby
-require 'escape_utils'
-
-start_at_level = 2
-
-headers = Hash.new(0)
-
-anchor = lambda { |title|
-  href = title.downcase
-  href.gsub!(/[^\w\- ]/, '') # remove punctuation
-  href.gsub!(' ', '-') # replace spaces with dash
-  href = EscapeUtils.escape_uri(href) # escape extended UTF-8 chars
-
-  uniq = (headers[href] > 0) ? "-#{headers[href]}" : ''
-  headers[href] += 1
-
-  href + uniq
-}
-
-ARGF.each_line do |line|
-  if line =~ /^(#+) (.+?)#*$/
-    level = $1.size
-    next if level < start_at_level
-    title = $2.strip
-    href  = anchor.call title
-
-    puts "%s* [%s](#%s)" % [
-      '  ' * (level - start_at_level),
-      title,
-      href
-    ]
-  end
-end