Fix link to Vite setup documentation (#1837)

Co-authored-by: Duncan McClean <duncan@doublethree.digital>

Author: klickmanufaktur

content/collections/pages/build-a-fieldtype.md

@@ -26,7 +26,7 @@ resources/
                 Uppercase.vue
 ```
 
-If you haven't already [set up Vite](https://statamic.dev.test/control-panel/css-javascript) for the Control Panel, the command will do it for you.
+If you haven't already [set up Vite](/control-panel/css-javascript) for the Control Panel, the command will do it for you.
 
 ## Registering
 
@@ -431,4 +431,4 @@ Fieldtype::appendConfigField('group', [
     'type' => 'text',
     'display' => 'A new group',
 ]);
-```
+```