chore: use esbuild instead of babel (#358)

引入 esbuild，提升构建速度。

before:

<img width="777" alt="image" src="https://github.com/halo-dev/docs/assets/21301288/49d28d76-1c10-47c8-ac8c-31b41a31f6bd">

after:

<img width="888" alt="image" src="https://github.com/halo-dev/docs/assets/21301288/61462a4c-ba66-4612-9363-67e5d394601b">


/kind improvement

```release-note
None
```

docusaurus.config.js

@@ -254,6 +254,16 @@ const config = {
       },
     ],
   ],
+  webpack: {
+    jsLoader: (isServer) => ({
+      loader: require.resolve('esbuild-loader'),
+      options: {
+        loader: 'tsx',
+        format: isServer ? 'cjs' : undefined,
+        target: isServer ? 'node12' : 'es2017',
+      },
+    }),
+  },
   scripts: [
     {
       src: "https://analytics.halo.run/script.js",