feat(docs): add 'Advanced' section with custom guide link

Author: Tino Koch

docs/.vitepress/config.ts

@@ -86,6 +86,12 @@ export default defineConfig({
           { text: 'Unreal Bloom', link: '/guide/three/unreal-bloom' },
         ].sort((a, b) => a.text.localeCompare(b.text)),
       },
+      {
+        text: 'Advanced',
+        items: [
+          { text: 'Custom', link: '/guide/advanced/you-might-not-need-post-processing' },
+        ],
+      },
     ],
 
     socialLinks: [

docs/guide/advanced/you-might-not-need-post-processing.md

@@ -0,0 +1,5 @@
+# You might not need this module
+
+Please note that you can use [Tres.js's attach feature](https://docs.tresjs.org/advanced/attach.html#arrays) instead of this module. It enables you to utilize any effect provided by Three.js, even if there is no corresponding component in post-processing.
+
+We recommend using post-processing because the props of the effects are reactive. The attach feature does not offer prop reactivity. However, if you do not require that advantage, is is a valid option to achieve equal results.