fix: use Chinese label for about link

Author: tw93

src/components/Footer.astro

@@ -4,7 +4,7 @@ import ThemeSwitch from './ThemeSwitch.astro';
 
 <footer class="site-footer">
   <nav class="footer-links">
-    <a href="https://tw93.fun/about.html">About</a>
+    <a href="https://tw93.fun/about.html">关于</a>
     <a href="https://github.com/tw93">GitHub</a>
     <a href="https://twitter.com/HiTw93">Twitter</a>
     <a href="https://tw93.fun">Blog</a>