chore: extend linting of code blocks in the docs (#40245)

* chore: extend linting of code blocks in the docs

* chore: combine lint:markdownlint and lint:markdown scripts

docs/tutorial/native-file-drag-drop.md

@@ -44,7 +44,7 @@ Add a draggable element to `index.html`, and reference your renderer script:
 
 In `renderer.js` set up the renderer process to handle drag events by calling the method you added via the [`contextBridge`][] above.
 
-```javascript @ts-expect-error=[3]
+```js @ts-expect-error=[3]
 document.getElementById('drag').ondragstart = (event) => {
   event.preventDefault()
   window.electron.startDrag('drag-and-drop.md')
@@ -56,15 +56,55 @@ document.getElementById('drag').ondragstart = (event) => {
 In the Main process (`main.js` file), expand the received event with a path to the file that is
 being dragged and an icon:
 
-```javascript fiddle='docs/fiddles/features/drag-and-drop'
-const { ipcMain } = require('electron')
+```fiddle docs/fiddles/features/drag-and-drop
+const { app, BrowserWindow, ipcMain } = require('electron/main')
+const path = require('node:path')
+const fs = require('node:fs')
+const https = require('node:https')
+
+function createWindow () {
+  const win = new BrowserWindow({
+    width: 800,
+    height: 600,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.js')
+    }
+  })
+
+  win.loadFile('index.html')
+}
+
+const iconName = path.join(__dirname, 'iconForDragAndDrop.png')
+const icon = fs.createWriteStream(iconName)
+
+// Create a new file to copy - you can also copy existing files.
+fs.writeFileSync(path.join(__dirname, 'drag-and-drop-1.md'), '# First file to test drag and drop')
+fs.writeFileSync(path.join(__dirname, 'drag-and-drop-2.md'), '# Second file to test drag and drop')
+
+https.get('https://img.icons8.com/ios/452/drag-and-drop.png', (response) => {
+  response.pipe(icon)
+})
+
+app.whenReady().then(createWindow)
 
 ipcMain.on('ondragstart', (event, filePath) => {
   event.sender.startDrag({
-    file: filePath,
-    icon: '/path/to/icon.png'
+    file: path.join(__dirname, filePath),
+    icon: iconName
   })
 })
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit()
+  }
+})
+
+app.on('activate', () => {
+  if (BrowserWindow.getAllWindows().length === 0) {
+    createWindow()
+  }
+})
 ```
 
 After launching the Electron application, try dragging and dropping