enhance: Add comprehensive .gitignore for deb-mock project

- Add mock-specific build artifacts (chroot/, mock-*, mockroot/)
- Include package build files (*.deb, *.changes, *.buildinfo)
- Add development tools (.coverage, .pytest_cache, .tox)
- Include system files (.DS_Store, Thumbs.db, ._*)
- Add temporary and backup files (*.tmp, *.bak, *.backup)
- Include local configuration overrides (config.local.yaml, .env.local)
- Add test artifacts and documentation builds
- Comprehensive coverage for Python build system project

This ensures build artifacts, chroot environments, and development
tools are properly ignored in version control.

docs/script/bootstrap

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+set -e
+
+gem install bundler
+bundle install

docs/script/cibuild

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -e
+
+bundle exec jekyll build
+bundle exec htmlproofer ./_site --check-html --check-sri
+bundle exec rubocop -D --config .rubocop.yml
+bundle exec script/validate-html
+gem build jekyll-theme-slate.gemspec

docs/script/release

@@ -0,0 +1,42 @@
+#!/bin/sh
+# Tag and push a release.
+
+set -e
+
+# Make sure we're in the project root.
+
+cd $(dirname "$0")/..
+
+# Make sure the darn thing works
+
+bundle update
+
+# Build a new gem archive.
+
+rm -rf jekyll-theme-slate-*.gem
+gem build -q jekyll-theme-slate.gemspec
+
+# Make sure we're on the master branch.
+
+(git branch | grep -q 'master') || {
+  echo "Only release from the master branch."
+  exit 1
+}
+
+# Figure out what version we're releasing.
+
+tag=v`ls jekyll-theme-slate-*.gem | sed 's/^jekyll-theme-slate-\(.*\)\.gem$/\1/'`
+
+# Make sure we haven't released this version before.
+
+git fetch -t origin
+
+(git tag -l | grep -q "$tag") && {
+  echo "Whoops, there's already a '${tag}' tag."
+  exit 1
+}
+
+# Tag it and bag it.
+
+gem push jekyll-theme-slate-*.gem && git tag "$tag" &&
+  git push origin master && git push origin "$tag"

docs/script/validate-html

@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "w3c_validators"
+
+def validator(file)
+  extension = File.extname(file)
+  if extension == ".html"
+    W3CValidators::NuValidator.new
+  elsif extension == ".css"
+    W3CValidators::CSSValidator.new
+  end
+end
+
+def validate(file)
+  puts "Checking #{file}..."
+
+  path = File.expand_path "../_site/#{file}", __dir__
+  results = validator(file).validate_file(path)
+
+  return puts "Valid!" if results.errors.empty?
+
+  results.errors.each { |err| puts err.to_s }
+  exit 1
+end
+
+validate "index.html"
+validate File.join "assets", "css", "style.css"