docs: update Custom Fields URL to GitHub Pages

Replace https://custom-fields.relaticle.com with
https://relaticle.github.io/custom-fields

Author: ManukMinasyan

docs/app.config.ts

@@ -49,7 +49,7 @@ export default defineAppConfig({
                 {
                     icon: 'i-lucide-sliders',
                     label: 'Custom Fields',
-                    to: 'https://custom-fields.relaticle.com',
+                    to: 'https://relaticle.github.io/custom-fields',
                     target: '_blank'
                 }
             ]

docs/content/index.md

@@ -138,7 +138,7 @@ Extend your Laravel applications with our ecosystem of complementary tools
     ---
     title: Custom Fields
     icon: i-lucide-sliders
-    to: https://custom-fields.relaticle.com
+    to: https://relaticle.github.io/custom-fields
     target: _blank
     ---
     :img{src="https://relaticle.github.io/custom-fields/og-image.png" alt="Custom Fields" class="mb-4 rounded-lg w-full pointer-events-none"}