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CONTRIBUTING.md

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+# Contributing
+
+## Development environment set up
+
+Install [bundler](http://bundler.io/):
+
+```
+$ gem install bundler
+```
+
+Install proejct dependencies using bundler:
+
+```
+$ bundle install --path vendor/bundle 
+```
+
+Start development server
+
+```
+$ bundle exec jekyll serve
+```
+
+Open up http://localhost:4000/
+
+(replace website with whatever `baseurl` is set to in `_config.yml`)
+
+## References
+
+* [Jekyll](https://jekyllrb.com/)
+* [Jekyll: baseurl explanation](https://byparker.com/blog/2014/clearing-up-confusion-around-baseurl/)

Gemfile

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+source "https://rubygems.org"
+
+# 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", "~> 3.6.0"
+
+# This is the default theme for new Jekyll sites. You may change this to anything you like.
+gem "minima", "~> 2.0"
+
+# 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"
+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 (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    colorator (1.1.0)
+    concurrent-ruby (1.1.4)
+    ffi (1.10.0)
+    ffi (1.10.0-x64-mingw32)
+    forwardable-extended (2.6.0)
+    jekyll (3.6.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 1.1)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 3)
+      safe_yaml (~> 1.0)
+    jekyll-feed (0.11.0)
+      jekyll (~> 3.3)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.5.0)
+      jekyll (~> 3.3)
+    jekyll-watch (1.5.1)
+      listen (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.1)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    minima (2.5.0)
+      jekyll (~> 3.5)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.0.3)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rouge (2.2.1)
+    ruby_dep (1.5.0)
+    safe_yaml (1.0.4)
+    sass (3.7.3)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    tzinfo (2.0.0)
+      concurrent-ruby (~> 1.0)
+    tzinfo-data (1.2018.9)
+      tzinfo (>= 1.0.0)
+
+PLATFORMS
+  ruby
+  x64-mingw32
+
+DEPENDENCIES
+  jekyll (~> 3.6.0)
+  jekyll-feed (~> 0.6)
+  minima (~> 2.0)
+  tzinfo-data
+
+BUNDLED WITH
+   2.0.1

Makefile

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+.PHONY: check serve
+
+HTML_FILES := $(shell find . -iname '*.html' -type f)
+
+check: $(HTML_FILES) vnu.jar
+	java -jar vnu.jar $(HTML_FILES)
+
+serve: vendor
+	bundle exec jekyll serve
+
+vendor:
+	bundle install --path vendor/bundle
+
+vnu.jar:
+	curl -Lf "https://github.com/validator/validator/releases/download/17.9.0/vnu.jar_17.9.0.zip" -o vnu.jar.zip
+	unzip -o -d /tmp/vnu vnu.jar.zip
+	cp /tmp/vnu/dist/vnu.jar .