Revert "Include generated documentation in repo for now"

This reverts commit 7ee72b80db.

.buildpack.rb

@@ -0,0 +1,29 @@
+require 'fileutils'
+
+class LanguagePack::Custom < LanguagePack::Rack
+  def self.use?
+    true
+  end
+
+  def name
+    "Nanoc"
+  end
+
+  # hack to hook into ruby pack 
+  def run_assets_precompile_rake_task
+    require 'benchmark'
+    topic "Compiling nanoc site"
+
+    cache_clear 'output' if ENV['CLEAR_CACHE']
+
+    puts "Found cached output directory." if cache_load 'output'
+    time = Benchmark.realtime { pipe("env PATH=$PATH:vendor/pygments:bin bundle exec nanoc compile") }
+
+    if $?.success?
+      cache_store 'output'
+      puts "Nanoc compilation completed (#{"%.2f" % time}s)"
+    else
+      exit $?.to_i
+    end
+  end
+end