switch to redcarpet for rendering

to support proper markdown functionality, see github markdown for reference

www/Gemfile

@@ -17,3 +17,5 @@ gem 'middleman-compass', '>= 4.0.0'
 gem 'middleman', '>= 4.0.0'
 gem 'middleman-livereload'
 gem 'middleman-autoprefixer'
+gem 'middleman-syntax'
+gem 'redcarpet'

www/Gemfile.lock

@@ -100,6 +100,9 @@ GEM
     middleman-sprockets (4.0.0)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
+    middleman-syntax (3.0.0)
+      middleman-core (>= 3.2)
+      rouge (~> 2.0)
     minitest (5.9.0)
     multi_json (1.12.1)
     padrino-helpers (0.13.3.2)
@@ -115,6 +118,8 @@ GEM
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
+    redcarpet (3.3.4)
+    rouge (2.0.6)
     sass (3.4.22)
     servolux (0.12.0)
     slim (3.0.7)
@@ -141,6 +146,8 @@ DEPENDENCIES
   middleman-compass (>= 4.0.0)
   middleman-livereload
   middleman-sprockets (>= 4.0.0)
+  middleman-syntax
+  redcarpet
   slim (>= 3.0)
   tzinfo-data
   wdm (~> 0.1.0)

www/config.rb

@@ -51,6 +51,7 @@ end
 activate :sprockets
 activate :autoprefixer
 activate :directory_indexes
+activate :syntax
 set :trailing_slash, false
-set :markdown_engine, :kramdown
-set :markdown, coderay_line_numbers: :table
+set :markdown_engine, :redcarpet
+set :markdown, fenced_code_blocks: true, smartypants: true, coderay_line_numbers: :table