Reduce middleman-syntax version

- Versions after 2.1 change how json syntax is highlighted (and it looks
worse)

Authored-by: Greg Cobb <gcobb@pivotal.io>

Author: Gerg

docs/v3/Gemfile

@@ -2,7 +2,7 @@ source 'http://rubygems.org'
 
 gem 'json', '>= 2.3.0'
 gem 'middleman', '~> 4.3'
-gem 'middleman-syntax', '~> 3.2'
+gem 'middleman-syntax', '2.1'
 gem 'middleman-autoprefixer', '~> 2.7'
 gem 'middleman-sprockets', '~> 4.1'
 gem 'middleman-gh-pages', '>= 0.0.3'
@@ -11,5 +11,4 @@ gem 'mini_racer'
 gem 'nokogiri', '~> 1.10.8'
 gem 'rake', '>= 12.3.3'
 gem 'redcarpet', '~> 3.5.0'
-gem 'rouge', '~> 3.21'
 gem 'sass'

docs/v3/Gemfile.lock

@@ -87,9 +87,9 @@ GEM
     middleman-sprockets (4.1.1)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
-    middleman-syntax (3.2.0)
+    middleman-syntax (2.1.0)
       middleman-core (>= 3.2)
-      rouge (~> 3.2)
+      rouge (~> 1.0)
     mini_portile2 (2.4.0)
     mini_racer (0.3.1)
       libv8 (~> 8.4.255)
@@ -113,7 +113,7 @@ GEM
       ffi (~> 1.0)
     redcarpet (3.5.0)
     rexml (3.2.4)
-    rouge (3.24.0)
+    rouge (1.11.1)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -144,12 +144,11 @@ DEPENDENCIES
   middleman-gh-pages (>= 0.0.3)
   middleman-livereload (>= 3.4.6)
   middleman-sprockets (~> 4.1)
-  middleman-syntax (~> 3.2)
+  middleman-syntax (= 2.1)
   mini_racer
   nokogiri (~> 1.10.8)
   rake (>= 12.3.3)
   redcarpet (~> 3.5.0)
-  rouge (~> 3.21)
   sass
 
 BUNDLED WITH