add sitediff for testing

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# gem "rails"
+
+gem "sitediff", "~> 1.1"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    diffy (3.3.0)
+    ethon (0.12.0)
+      ffi (>= 1.3.0)
+    ffi (1.14.2)
+    mini_portile2 (2.5.0)
+    minitar (0.9)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    pkg-config (1.4.4)
+    public_suffix (3.1.1)
+    racc (1.5.2)
+    rainbow (3.0.0)
+    sitediff (1.1.1)
+      addressable (~> 2.5.2)
+      diffy (~> 3.3.0)
+      minitar (~> 0.9)
+      nokogiri (>= 1.10.4)
+      pkg-config (~> 1.1)
+      rainbow (~> 3.0.0)
+      thor (~> 0.20.0)
+      typhoeus (~> 1.0)
+    thor (0.20.3)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  sitediff (~> 1.1)
+
+BUNDLED WITH
+   2.1.4

sitediff/.gitignore

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+# Directories.
+diffs
+snapshot
+# Files.
+settings.yaml
+paths.txt
+failures.txt
+report.html

sitediff/sitediff.yaml

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+---
+before:
+  url: http://localhost:9000
+after:
+  url: http://localhost:9000
+settings: {}