chore: update copyright year to 2023

Author: zhh2001

README.md

@@ -41,4 +41,4 @@
 
 ## 许可证
 
-[MIT](./LICENSE) © 2024-present Henghua Zhang
+[MIT](./LICENSE) © 2023-present Henghua Zhang

docs/.vitepress/config.js

@@ -134,7 +134,7 @@ export default defineConfig({
     },
     footer: {
       message: 'Released under the MIT License.',
-      copyright: 'Copyright © 2024-present Henghua Zhang'
+      copyright: 'Copyright © 2023-present Henghua Zhang'
     },
     nav: [
       { text: '首页', link: '/' },