Add banner

Author: sten

README.md

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+<img src="documentation/screenshots/banner.jpg" alt="Laravel Flexible Content Block Pages banner" width="100%" />
+
 # Filament Flexible Content Block Pages
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/statikbe/laravel-filament-flexible-content-block-pages.svg?style=flat-square)](https://packagist.org/packages/statikbe/laravel-filament-flexible-content-block-pages)
+
 [![GitHub Tests Action Status](https://img.shields.io/github/actions/workflow/status/statikbe/laravel-filament-flexible-content-block-pages/run-tests.yml?branch=main&label=tests&style=flat-square)](https://github.com/statikbe/laravel-filament-flexible-content-block-pages/actions?query=workflow%3Arun-tests+branch%3Amain)
 [![GitHub Code Style Action Status](https://img.shields.io/github/actions/workflow/status/statikbe/laravel-filament-flexible-content-block-pages/fix-php-code-style-issues.yml?branch=main&label=code%20style&style=flat-square)](https://github.com/statikbe/laravel-filament-flexible-content-block-pages/actions?query=workflow%3A"Fix+PHP+code+style+issues"+branch%3Amain)
 [![Total Downloads](https://img.shields.io/packagist/dt/statikbe/laravel-filament-flexible-content-block-pages.svg?style=flat-square)](https://packagist.org/packages/statikbe/laravel-filament-flexible-content-block-pages)