docs: move rebuild to "Installation" section to make it more visible (#57)

Author: stasadev

README.md

@@ -23,6 +23,12 @@ ddev add-on get ddev/ddev-frankenphp
 ddev restart
 ```
 
+(Optional) To rebuild FrankenPHP without cache, use:
+
+```bash
+ddev utility rebuild
+```
+
 After installation, make sure to commit the `.ddev` directory to version control.
 
 ## Usage
@@ -35,11 +41,6 @@ After installation, make sure to commit the `.ddev` directory to version control
 | `ddev php -m`             | View installed PHP extensions      |
 | `ddev logs -f`            | View FrankenPHP logs               |
 
-> [!TIP]
-> FrankenPHP is updated automatically when you update DDEV.
->
-> To update it manually, run `ddev utility rebuild`.
-
 ## Advanced Customization
 
 Install pre-packaged extensions using the `php-zts-` prefix (see [supported extensions](https://pkg.henderkes.com/84/php-zts/packages?type=debian)):