Fix "npm run tidy:check" to include markdownlint

Author: data-douser

package.json

@@ -40,7 +40,7 @@
     "dev:stdio": "npm run dev:stdio -w server",
     "dev:http": "npm run dev:http -w server",
     "format": "prettier --write '**/*.{yml,yaml,md}'",
-    "format:check": "prettier --check '**/*.{yml,yaml,md}'",
+    "format:check": "prettier --check '**/*.{yml,yaml,md}' && npm run lint:md",
     "lint": "npm run lint -w client -w server -w extensions/vscode",
     "lint:fix": "npm run lint:fix -w client -w server -w extensions/vscode",
     "lint:md": "markdownlint '**/*.md'",