Using Travis to deploy

.travis.yml

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+language: ruby
+rvm:
+  - 2.4.1
+
+before_script:
+  - chmod +x ./script/cibuild # or do this locally and commit
+
+# Assume bundler is being used, therefore
+# the `install` step will run `bundle install` by default.
+script: ./script/cibuild
+
+# branch whitelist, only for GitHub Pages
+branches:
+  only:
+    - master     # test the master branch
+
+env:
+  global:
+    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer
+
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+
+sudo: false # route your build to the container-based infrastructure for a faster build
+
+cache: bundler # caching bundler gem packages will speed up build
+
+deploy:
+  provider: pages
+  skip_cleanup: true
+  github_token: $GITHUB_TOKEN  # Set in the settings page of your repository, as a secure variable
+  keep_history: true
+  on:
+    branch: gh-pages
+  local_dir: _site

Gemfile

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+source "https://rubygems.org"
+
+gem "jekyll"
+gem "html-proofer"

script/cibuild

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+#!/usr/bin/env bash
+set -e # halt script on error
+
+bundle exec jekyll build
+bundle exec htmlproofer ./_site