docs: document preact templates

Author: yyx990803

docs/guide/index.md

@@ -30,10 +30,13 @@ npm init @vitejs/app my-vue-app --template vue
 
 Supported template presets include:
 
+- `vanilla`
 - `vue`
 - `vue-ts`
 - `react`
 - `react-ts`
+- `preact`
+- `preact-ts`
 
 See [@vitejs/create-app](https://github.com/vitejs/vite/tree/main/packages/create-app) for more details on each template.
 

packages/create-app/README.md

@@ -32,3 +32,5 @@ Currently supported template presets include:
 - `vue-ts`
 - `react`
 - `react-ts`
+- `preact`
+- `preact-ts`