Upgrade dependencies, including pa11y-ci to 4 from 2

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+indent_style = space
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[package.json]
+indent_style = space
+indent_size = 2

.github/workflows/build-and-test.yml

@@ -1,33 +1,29 @@
-
-name: Build and test
-
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
-    branches:
-      - master
 
 jobs:
-  checkout_and_test:
-    runs-on: ubuntu-20.04
+  build:
+    runs-on: ubuntu-latest
     steps:
-      - name: Checkout code from ${{ github.repository }}
-        uses: actions/checkout@v2
-      - name: Setup node
-        uses: actions/setup-node@v2
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
         with:
-          node-version: 8
-      - name: Install node dependencies
-        run: npm ci
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+          bundler-cache: true
+      - run: make build
+
+  test:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-      - name: Install Ruby gems
-        run: make install
-      - name: Build and serve Jekyll website
-        run: make serve &
-      - name: Test Jekyll website with Pa11y
-        run: make test
+      - uses: actions/setup-node@v3
+        with:
+          node-version-file: .nvmrc
+      - run: npm ci
+      - run: make serve
+      - run: make test

.gitignore

@@ -1,3 +1,4 @@
 .sass-cache
 _site
 node_modules
+.tool-versions

.npmrc

@@ -0,0 +1 @@
+lockfile-version=2

.nvmrc

@@ -1 +1 @@
-8
+20

.pa11yci

@@ -1,5 +1,5 @@
 {
 	"defaults": {
-		"concurrency": 6
+		"concurrency": 1
 	}
 }

.ruby-version

@@ -1 +1 @@
-2.6.3
+3.3.5

.vscode/extensions.json

@@ -1,5 +1,7 @@
 {
     "recommendations": [
-        "ms-vscode.makefile-tools"
+        "ms-vscode.makefile-tools",
+        "github.vscode-github-actions",
+        "editorconfig.editorconfig"
     ]
-}
+}

Gemfile

@@ -1,2 +1,4 @@
 source 'https://rubygems.org'
-gem 'github-pages'
+
+gem 'github-pages', "~> 228", group: :jekyll_plugins
+gem "webrick", "~> 1.8"