feat: add link to fastfony and symfony website

Author: neothone

content/index.mdx

@@ -1,6 +1,6 @@
 # Get started with Fastfony
 
-Fastfony is a Symfony boilerplate and starter kit that provides a solid foundation for building web applications. It includes a variety of features and tools to help you get started quickly and efficiently.
+[Fastfony](https://fastfony.com) is a [Symfony](https://symfony.com) boilerplate and starter kit that provides a solid foundation for building web applications. It includes a variety of features and tools to help you get started quickly and efficiently.
 
 ## Prerequisites