chore(ci): add markdown linting to markdown workflow

.github/workflows/markdown.yml

@@ -15,6 +15,11 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - uses: DavidAnson/markdownlint-cli2-action@v11
+        with:
+          globs: "**.md"
+          config: .markdownlint.json
+
       - uses: reviewdog/action-misspell@v1
         with:
           locale: "US"

.markdownlint.json

@@ -0,0 +1,3 @@
+{
+  "MD013": false
+}