docs: use sortByFileName method

docs/.vitepress/config.mjs

@@ -8,7 +8,8 @@ export default {
 			root: 'docs',
 			collapsible: false,
 			collapsed: false,
-			useTitleFromFileHeading: true
+			useTitleFromFileHeading: true,
+			sortByFileName: ['getting-started.md', 'build-configuration.md', 'npm-scripts.md']
 		}),
 		socialLinks: [{ icon: 'github', link: 'https://github.com/jooy2/vutron' }]
 	}