chore: update @docsearch/css (#166)

Follow up of #159 , I forgot to update the css version.

Author: ydcjeff

themes/ignite/layouts/partials/HeadTag.html

@@ -47,8 +47,8 @@
   <!-- css -->
   <link rel="preload" href="https://rsms.me/inter/inter.css" as="style" />
   <link rel="stylesheet" href="https://rsms.me/inter/inter.css" />
-  <link rel="preload" href="https://cdn.jsdelivr.net/npm/@docsearch/css@1.0.0-alpha.28/dist/style.min.css" as="style" />
-  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@docsearch/css@1.0.0-alpha.28/dist/style.min.css"
+  <link rel="preload" href="https://cdn.jsdelivr.net/npm/@docsearch/css@3.3.0/dist/style.min.css" as="style" />
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@docsearch/css@3.3.0/dist/style.min.css"
     type="text/css" />
 
   {{ $style := resources.Get "_hugo/css/style.css" | fingerprint "md5" | minify }}