fix: docs/v3/Gemfile & docs/v3/Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-RACK-569066

Author: snyk-bot

docs/v3/Gemfile.lock

@@ -1,158 +1,136 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (4.2.11.1)
-      i18n (~> 0.7)
+    activesupport (5.0.7.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    autoprefixer-rails (9.7.4)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    autoprefixer-rails (9.7.6)
       execjs
-    capybara (2.4.4)
-      mime-types (>= 1.16)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (~> 2.0)
-    chunky_png (1.3.11)
+    backports (3.17.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    compass (1.0.3)
-      chunky_png (~> 1.2)
-      compass-core (~> 1.0.2)
-      compass-import-once (~> 1.0.5)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-      sass (>= 3.3.13, < 3.5)
-    compass-core (1.0.3)
-      multi_json (~> 1.0)
-      sass (>= 3.3.0, < 3.5)
-    compass-import-once (1.0.5)
-      sass (>= 3.2, < 3.5)
+    concurrent-ruby (1.1.6)
+    contracts (0.13.0)
+    dotenv (2.7.5)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
+    fast_blank (1.0.0)
+    fastimage (2.1.7)
     ffi (1.12.2)
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
-    hike (1.2.3)
-    hooks (0.4.1)
-      uber (~> 0.0.14)
+    hamster (3.0.0)
+      concurrent-ruby (~> 1.0)
+    hashie (3.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (2.3.0)
     kramdown (1.17.0)
     libv8 (7.3.492.27.1)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    middleman (3.4.1)
+    memoist (0.16.2)
+    middleman (4.3.6)
       coffee-script (~> 2.2)
-      compass (>= 1.0.0, < 2.0.0)
-      compass-import-once (= 1.0.5)
-      execjs (~> 2.0)
       haml (>= 4.0.5)
       kramdown (~> 1.2)
-      middleman-core (= 3.4.1)
-      middleman-sprockets (>= 3.1.2)
-      sass (>= 3.4.0, < 4.0)
-      uglifier (~> 2.5)
+      middleman-cli (= 4.3.6)
+      middleman-core (= 4.3.6)
     middleman-autoprefixer (2.10.1)
       autoprefixer-rails (~> 9.1)
       middleman-core (>= 3.3.3)
-    middleman-core (3.4.1)
-      activesupport (~> 4.1)
-      bundler (~> 1.1)
-      capybara (~> 2.4.4)
+    middleman-cli (4.3.6)
+      thor (>= 0.17.0, < 2.0)
+    middleman-core (4.3.6)
+      activesupport (>= 4.2, < 5.1)
+      addressable (~> 2.3)
+      backports (~> 3.6)
+      bundler
+      contracts (~> 0.13.0)
+      dotenv
       erubis
-      hooks (~> 0.3)
-      i18n (~> 0.7.0)
-      listen (~> 3.0.3)
-      padrino-helpers (~> 0.12.3)
-      rack (>= 1.4.5, < 2.0)
-      thor (>= 0.15.2, < 2.0)
-      tilt (~> 1.4.1, < 2.0)
+      execjs (~> 2.0)
+      fast_blank
+      fastimage (~> 2.0)
+      hamster (~> 3.0)
+      hashie (~> 3.4)
+      i18n (~> 0.9.0)
+      listen (~> 3.0.0)
+      memoist (~> 0.14)
+      padrino-helpers (~> 0.13.0)
+      parallel
+      rack (>= 1.4.5, < 3)
+      sassc (~> 2.0)
+      servolux
+      tilt (~> 2.0.9)
+      uglifier (~> 3.0)
     middleman-gh-pages (0.4.1)
       rake (> 0.9.3)
     middleman-livereload (3.4.6)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
-    middleman-sprockets (3.5.0)
-      middleman-core (>= 3.3)
-      sprockets (~> 2.12.1)
-      sprockets-helpers (~> 1.1.0)
-      sprockets-sass (~> 1.3.0)
-    middleman-syntax (2.0.0)
-      middleman-core (~> 3.2)
-      rouge (~> 1.0)
-    mime-types (3.3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2019.1009)
+    middleman-syntax (3.2.0)
+      middleman-core (>= 3.2)
+      rouge (~> 3.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.9)
       libv8 (>= 6.9.411)
     minitest (5.14.0)
-    multi_json (1.14.1)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
-    padrino-helpers (0.12.9)
+    padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.12.9)
+      padrino-support (= 0.13.3.4)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.12.9)
+    padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    rack (1.6.13)
+    parallel (1.19.1)
+    public_suffix (4.0.5)
+    rack (2.2.2)
     rack-livereload (0.3.17)
       rack
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
     rake (13.0.1)
-    rb-fsevent (0.10.3)
+    rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.3.3)
-    rouge (1.10.1)
-    sass (3.4.25)
-    sprockets (2.12.5)
-      hike (~> 1.2)
-      multi_json (~> 1.0)
-      rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
-    sprockets-helpers (1.1.0)
-      sprockets (~> 2.0)
-    sprockets-sass (1.3.1)
-      sprockets (~> 2.0)
-      tilt (~> 1.1)
+    rouge (3.19.0)
+    sassc (2.3.0)
+      ffi (~> 1.9)
+    servolux (0.13.0)
     temple (0.8.2)
     thor (1.0.1)
     thread_safe (0.3.6)
-    tilt (1.4.1)
-    tzinfo (1.2.6)
+    tilt (2.0.10)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
-    uber (0.0.15)
-    uglifier (2.7.2)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
-    xpath (2.1.0)
-      nokogiri (~> 1.3)
+    uglifier (3.2.0)
+      execjs (>= 0.3.0, < 3)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   json (>= 2.3.0)
-  middleman (>= 3.4.1)
-  middleman-autoprefixer (>= 2.6.1)
+  middleman (>= 4.1.11)
+  middleman-autoprefixer (>= 2.10.1)
   middleman-gh-pages (>= 0.0.3)
   middleman-livereload (>= 3.4.6)
-  middleman-syntax (>= 2.0.0)
+  middleman-syntax (>= 2.1.0)
   mini_racer
   nokogiri
   rake (>= 12.3.3)