chore: Update markdown validation scripts to exclude node_modules

- Update markdown:check and markdown:fix scripts to only validate project files
- Exclude node_modules from markdown validation to reduce noise
- Focus validation on doc/*.md and root *.md files only

Resolves: Markdown validation noise from external dependencies

package.json

@@ -12,7 +12,9 @@
     "prepublishOnly": "npm run build",
     "test": "jest",
     "lint": "eslint . --ext .ts",
-    "format": "prettier --write \"src/**/*.ts\""
+    "format": "prettier --write \"src/**/*.ts\"",
+    "markdown:check": "markdownlint-cli2 \"doc/*.md\" \"*.md\"",
+    "markdown:fix": "markdownlint-cli2 --fix \"doc/*.md\" \"*.md\""
   },
   "keywords": [
     "capacitor",
@@ -39,6 +41,7 @@
     "jest": "^29.5.0",
     "jest-environment-jsdom": "^30.0.5",
     "jsdom": "^26.1.0",
+    "markdownlint-cli2": "^0.18.1",
     "prettier": "^2.8.7",
     "rimraf": "^4.4.0",
     "rollup": "^3.20.0",