Add markdown linting to workflows

Author: wolf99

.github/workflows/lint-docs.yml

@@ -0,0 +1,19 @@
+name: "Lint documentation"
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main, linux ]
+  pull_request:
+    branches: [ main, linux ]
+
+jobs:
+  lint-markdown:
+    name: Lint markdown files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@dcd71f646680f2efd8db4afa5ad64fdcba30e748
+
+      - uses: DavidAnson/markdownlint-cli2-action@744f913a124058ee903768d3adb92a4847e5d132
+        with:
+          globs: "**/*.md"

.markdownlint.jsonc

@@ -0,0 +1,6 @@
+// For information on writing markdownlint configuration see:
+//  https://github.com/DavidAnson/markdownlint/blob/main/README.md#optionsconfig
+{
+    "MD013": false,  // Line length and line breaking convention not yet standardised across docs
+    "MD024": false   // The format for some files require repeated headings, e.g. "Example"
+}