Initial travis config with link checking

.travis.yml

@@ -0,0 +1,18 @@
+language: ruby
+rvm:
+  - 2.5.3
+
+before_script:
+  - gem install html-proofer
+
+# Assume bundler is being used, therefore
+# the `install` step will run `bundle install` by default.
+script:
+  - bundle exec jekyll build
+  - bundle exec htmlproofer ./_site --assume-extension 
+
+env:
+  global:
+  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer
+
+cache: bundler # caching bundler gem packages will speed up build

Gemfile

@@ -30,4 +30,5 @@ gem "wdm", "~> 0.1.0" if Gem.win_platform?
 
 group :development, :test do
   gem "pry"
+  gem "html-proofer"
 end

_config.yml

@@ -15,17 +15,17 @@ defaults:
   - scope:
       path: "*"
     values:
-      root: "../.."
+      root: ".."
   - scope:
       path: "*/*"
     values:
-      root: "../../.."
+      root: "../.."
   - scope:
       path: "*/*/*"
     values:
-      root: "../../../.."
+      root: "../../.."
 
-default_root: "../../.."
+default_root: "../.."
 
 collections_dir: docs
 collections: