Add _config.yml & Gemfile for latest Jekyll

Gemfile

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+source "https://rubygems.org"
+ruby RUBY_VERSION
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# 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", "3.4.0"
+
+# 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
+
+# If you have any plugins, put them here!
+group :jekyll_plugins do
+   gem "jekyll-feed", "~> 0.6"
+   gem "jekyll-sitemap"
+   gem "jekyll-livereload"
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.5.0)
+      public_suffix (~> 2.0, >= 2.0.2)
+    colorator (1.1.0)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.2)
+    ffi (1.9.17)
+    forwardable-extended (2.6.0)
+    http_parser.rb (0.6.0)
+    jekyll (3.4.0)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 1.1)
+      kramdown (~> 1.3)
+      liquid (~> 3.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (~> 1.7)
+      safe_yaml (~> 1.0)
+    jekyll-feed (0.8.0)
+      jekyll (~> 3.3)
+    jekyll-livereload (0.2.2)
+      em-websocket (~> 0.5)
+      jekyll (~> 3.0)
+    jekyll-sass-converter (1.5.0)
+      sass (~> 3.4)
+    jekyll-sitemap (1.0.0)
+      jekyll (~> 3.3)
+    jekyll-watch (1.5.0)
+      listen (~> 3.0, < 3.1)
+    kramdown (1.13.2)
+    liquid (3.0.6)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    mercenary (0.3.6)
+    pathutil (0.14.0)
+      forwardable-extended (~> 2.6)
+    public_suffix (2.0.5)
+    rb-fsevent (0.9.8)
+    rb-inotify (0.9.8)
+      ffi (>= 0.5.0)
+    rouge (1.11.1)
+    safe_yaml (1.0.4)
+    sass (3.4.23)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  jekyll (= 3.4.0)
+  jekyll-feed (~> 0.6)
+  jekyll-livereload
+  jekyll-sitemap
+  tzinfo-data
+
+RUBY VERSION
+   ruby 2.3.3p222
+
+BUNDLED WITH
+   1.14.3

_config.yml

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+# Build settings
+markdown: kramdown
+
+gems: 
+    - jekyll-feed
+    - jekyll-sitemap
+exclude:
+    - Gemfile
+    - Gemfile.lock
+    - docker-compose.yml