Create workflow to lint Markdown files

.github/workflows/lint-markdown.yml

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+name: "Lint Markdown"
+
+on:
+  merge_group:
+  pull_request:
+  push:
+    branches: [ master ]
+
+jobs:
+  lint_project:
+    name: "Lint Markdown"
+    runs-on: ubuntu-latest
+    permissions:
+      statuses: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Lint Markdown
+        uses: DavidAnson/markdownlint-cli2-action@v16
+        with:
+          config: ".markdownlint.jsonc"
+          globs: "docs/**/*.md"

.markdownlint.jsonc

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+// https://github.com/DavidAnson/markdownlint/blob/main/schema/.markdownlint.jsonc
+{
+  "MD013": {
+    "line_length": 120,
+    "heading_line_length": 120,
+    "code_block_line_length": 120
+  }
+}