FEAT [#20442] : adds the fiddle for launching an app from URL in another app, including all 3 files main.js, index.html, renderer.js (#20718)

docs/fiddles/system/protocol-handler/launch-app-from-URL-in-another-app/renderer.js

@@ -0,0 +1,14 @@
+const { shell } = require('electron')
+const path = require('path')
+
+const openInBrowserButton = document.getElementById('open-in-browser')
+const openAppLink = document.getElementById('open-app-link')
+// Hides openAppLink when loaded inside Electron
+openAppLink.style.display = 'none'
+
+openInBrowserButton.addEventListener('click', () => {
+  console.log('clicked')
+  const pageDirectory = __dirname.replace('app.asar', 'app.asar.unpacked')
+  const pagePath = path.join('file://', pageDirectory, 'index.html')
+  shell.openExternal(pagePath)
+})