Switch back to latest version of jekyll

We no longer have GitHub Pages render the jekyll site for us, but
rather we generate static html into the docs folder offline. Hence we
can use whatever jekyll version we want.

Gemfile

@@ -1,18 +1,6 @@
 source 'https://rubygems.org'
 
-# Hello! This is where you manage which Jekyll version is used to run.
+gem 'jekyll', '3.5.0'
-# When you want to use a different version, change it below, save the
-# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
-#
-#     bundle exec jekyll serve
-#
-# This will help ensure the proper Jekyll version is running.
-# Happy Jekylling!
-# gem 'jekyll', '3.5.0'
-
-# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
-# uncomment the line below. To upgrade, run `bundle update github-pages`.
-gem 'github-pages', group: :jekyll_plugins
 
 group :development do
   gem 'rake'

Gemfile.lock

@@ -1,90 +1,24 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.8)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
     ast (2.3.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.12.2)
     colorator (1.1.0)
     concurrent-ruby (1.0.5)
-    ethon (0.10.1)
-      ffi (>= 1.3.0)
     execjs (2.7.0)
     extras (0.3.0)
       forwardable-extended (~> 2.5)
-    faraday (0.12.1)
-      multipart-post (>= 1.2, < 3)
     fastimage (2.1.0)
     ffi (1.9.18)
     forwardable-extended (2.6.0)
-    gemoji (3.0.0)
+    jekyll (3.5.0)
-    github-pages (141)
-      activesupport (= 4.2.8)
-      github-pages-health-check (= 1.3.4)
-      jekyll (= 3.4.3)
-      jekyll-avatar (= 0.4.2)
-      jekyll-coffeescript (= 1.0.1)
-      jekyll-default-layout (= 0.1.4)
-      jekyll-feed (= 0.9.2)
-      jekyll-gist (= 1.4.0)
-      jekyll-github-metadata (= 2.4.0)
-      jekyll-mentions (= 1.2.0)
-      jekyll-optional-front-matter (= 0.1.2)
-      jekyll-paginate (= 1.1.0)
-      jekyll-readme-index (= 0.1.0)
-      jekyll-redirect-from (= 0.12.1)
-      jekyll-relative-links (= 0.4.1)
-      jekyll-sass-converter (= 1.5.0)
-      jekyll-seo-tag (= 2.2.3)
-      jekyll-sitemap (= 1.0.0)
-      jekyll-swiss (= 0.4.0)
-      jekyll-theme-architect (= 0.0.4)
-      jekyll-theme-cayman (= 0.0.4)
-      jekyll-theme-dinky (= 0.0.4)
-      jekyll-theme-hacker (= 0.0.4)
-      jekyll-theme-leap-day (= 0.0.4)
-      jekyll-theme-merlot (= 0.0.4)
-      jekyll-theme-midnight (= 0.0.4)
-      jekyll-theme-minimal (= 0.0.4)
-      jekyll-theme-modernist (= 0.0.4)
-      jekyll-theme-primer (= 0.2.1)
-      jekyll-theme-slate (= 0.0.4)
-      jekyll-theme-tactile (= 0.0.4)
-      jekyll-theme-time-machine (= 0.0.4)
-      jekyll-titles-from-headings (= 0.2.0)
-      jemoji (= 0.8.0)
-      kramdown (= 1.13.2)
-      liquid (= 3.0.6)
-      listen (= 3.0.6)
-      mercenary (~> 0.3)
-      minima (= 2.1.1)
-      rouge (= 1.11.1)
-      terminal-table (~> 1.4)
-    github-pages-health-check (1.3.4)
-      addressable (~> 2.3)
-      net-dns (~> 0.8)
-      octokit (~> 4.0)
-      public_suffix (~> 2.0)
-      typhoeus (~> 0.7)
-    html-pipeline (2.6.0)
-      activesupport (>= 2)
-      nokogiri (>= 1.4)
-    i18n (0.8.4)
-    jekyll (3.4.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
       kramdown (~> 1.3)
-      liquid (~> 3.0)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
       rouge (~> 1.7)
@@ -97,92 +31,22 @@ GEM
       pathutil (>= 0.8)
       rack (~> 1.6)
       sprockets (~> 3.3, < 3.8)
-    jekyll-avatar (0.4.2)
-      jekyll (~> 3.0)
-    jekyll-coffeescript (1.0.1)
-      coffee-script (~> 2.2)
-    jekyll-default-layout (0.1.4)
-      jekyll (~> 3.0)
-    jekyll-feed (0.9.2)
-      jekyll (~> 3.3)
-    jekyll-gist (1.4.0)
-      octokit (~> 4.2)
-    jekyll-github-metadata (2.4.0)
-      jekyll (~> 3.1)
-      octokit (~> 4.0, != 4.4.0)
-    jekyll-mentions (1.2.0)
-      activesupport (~> 4.0)
-      html-pipeline (~> 2.3)
-      jekyll (~> 3.0)
-    jekyll-optional-front-matter (0.1.2)
-      jekyll (~> 3.0)
-    jekyll-paginate (1.1.0)
     jekyll-pants (0.2.1)
       rubypants
-    jekyll-readme-index (0.1.0)
-      jekyll (~> 3.0)
-    jekyll-redirect-from (0.12.1)
-      jekyll (~> 3.3)
-    jekyll-relative-links (0.4.1)
-      jekyll (~> 3.3)
     jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
     jekyll-seo-tag (2.2.3)
       jekyll (~> 3.3)
     jekyll-sitemap (1.0.0)
       jekyll (~> 3.3)
-    jekyll-swiss (0.4.0)
-    jekyll-theme-architect (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-cayman (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-dinky (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-hacker (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-leap-day (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-merlot (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-midnight (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-minimal (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-modernist (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-primer (0.2.1)
-      jekyll (~> 3.3)
-    jekyll-theme-slate (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-tactile (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-theme-time-machine (0.0.4)
-      jekyll (~> 3.3)
-    jekyll-titles-from-headings (0.2.0)
-      jekyll (~> 3.3)
     jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    jemoji (0.8.0)
+    kramdown (1.14.0)
-      activesupport (~> 4.0)
+    liquid (4.0.0)
-      gemoji (~> 3.0)
+    listen (3.0.8)
-      html-pipeline (~> 2.2)
+      rb-fsevent (~> 0.9, >= 0.9.4)
-      jekyll (>= 3.0)
+      rb-inotify (~> 0.9, >= 0.9.7)
-    kramdown (1.13.2)
-    liquid (3.0.6)
-    listen (3.0.6)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.2.0)
-    minima (2.1.1)
-      jekyll (~> 3.3)
-    minitest (5.10.2)
-    multipart-post (2.0.0)
-    net-dns (0.8.0)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
-    octokit (4.7.0)
-      sawyer (~> 0.8.0, >= 0.5.3)
     parser (2.4.0.0)
       ast (~> 2.2)
     pathutil (0.14.0)
@@ -205,20 +69,10 @@ GEM
     ruby-progressbar (1.8.1)
     rubypants (0.6.0)
     safe_yaml (1.0.4)
-    sass (3.4.24)
+    sass (3.4.25)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    terminal-table (1.8.0)
-      unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
-    typhoeus (0.8.0)
-      ethon (>= 0.8.0)
-    tzinfo (1.2.3)
-      thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.3.0)
@@ -227,7 +81,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  github-pages
+  jekyll (= 3.5.0)
   jekyll-assets
   jekyll-pants
   jekyll-seo-tag

_config.yml

@@ -30,7 +30,7 @@ update:
     document: common-flow.md
     diagram: common-flow.svg
 
-gems:
+plugins:
   - jekyll-assets
   - jekyll-pants
   - jekyll-sitemap