update(screenshots): replace dashboard, marketplace, settings, and skills images; update preload script extension

Author: beautyfree

docs/images/screenshots/dashboard.png

@@ -142,7 +142,7 @@ function createMainWindow(): BrowserWindow {
 					},
 				}),
 		webPreferences: {
-			preload: join(__dirname, "../preload/index.js"),
+			preload: join(__dirname, "../preload/index.mjs"),
 			sandbox: false,
 			contextIsolation: true,
 			nodeIntegration: false,