docs: update banner

Signed-off-by: Wibus <[email protected]>

Author: wibus-wee

theme.config.tsx

@@ -92,12 +92,10 @@ const config: DocsThemeConfig = {
     text: 'Edit this page on GitHub →'
   },
   banner: {
-    // key: 'theme-shiro',
-    // text: <a href="https://github.com/Innei/Shiro" target="_blank">
-    //   🎨 New Mix Space theme `Shiro` is released. Read more →
-    // </a>,
-    key: 'wip',
-    text: <span>🔨 This site is still under construction. Please come back later.</span>,
+    key: 'theme-shiro',
+    text: <a href="https://mx-space.js.org/themes/shiro" target="_blank">
+      🎨 New Mix Space theme `Shiro` is released. Read more →
+    </a>,
   },
 }