Markdown linting and link check

.github/markdown-link-check.jsonc

@@ -0,0 +1,10 @@
+{
+  "httpHeaders": [
+    {
+      "urls": ["https://github.com/", "https://guides.github.com/", "https://help.github.com/", "https://docs.github.com/"],
+      "headers": {
+        "Accept-Encoding": "zstd, br, gzip, deflate"
+      }
+    }
+  ],
+}

.github/markdownlint.json

@@ -0,0 +1,18 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "markdownlint",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.*):(\\d+)(:(\\d+))? (MD\\d+\\/[^ ]+) (.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 4,
+          "code": 5,
+          "message": 6
+        }
+      ]
+    }
+  ]
+}

.github/markdownlint.jsonc

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+{
+  "default": true,
+  "MD013": {
+    "line_length": 120
+  },
+  "MD014": false,
+  "MD029": false,
+  "MD025": false,
+  "MD034": false,
+  "MD041": false
+}

.github/workflows/markdown.yml

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+name: markdown
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/markdown.yml'
+      - '.github/markdownlint.json'
+      - '.github/markdownlint.jsonc'
+      - '.github/markdown-link-check.jsonc'
+      - '**/*.md'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  markdown-lint:
+    name: Lint markdown files
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout devtools
+        uses: actions/checkout@v4
+
+      - name: Register markdownlint warning matcher
+        run: |
+          echo "::add-matcher::.github/markdownlint.json"
+
+      - name: Lint markdown files
+        uses: avto-dev/markdown-lint@v1
+        with:
+          args: '**/*.md'
+          config: '.github/markdownlint.jsonc'
+
+      - name: Remove markdownlint warning matcher
+        if: always()
+        run: |
+          echo "::remove-matcher owner=markdownlint::"
+
+      - uses: gaurav-nelson/github-action-markdown-link-check@master
+        if: always()
+        with:
+          use-verbose-mode: 'yes'
+          check-modified-files-only: 'yes'
+          base-branch: ${{ github.base_ref }}
+          config-file: '.github/markdown-link-check.jsonc'