Update coverage badge path and remove obsolete file

Updated the coverage badge file path configuration and README reference to reflect the new location. Removed the outdated `badge-coverage.svg` file from the `assets` directory to avoid redundancy.

Author: Fa-BRAIK

.github/workflows/phpunit-coverage-badge.yml

@@ -42,6 +42,6 @@ jobs:
       - name: Generate test coverage badge
         uses: timkrase/phpunit-coverage-badge@v1.2.1
         with:
-          coverage_badge_path: 'assets/badge-coverage.svg'
+          coverage_badge_path: 'badge-coverage.svg'
           push_badge: true
           repo_token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -5,7 +5,7 @@
 ![PhpStan Level](https://img.shields.io/badge/PHPStan-level%2010-brightgreen.svg)
 [![PHPStan Checks](https://github.com/nuxtifyts/php-dto/actions/workflows/phpstan-tests.yml/badge.svg)](https://github.com/nuxtifyts/php-dto/actions/workflows/phpstan-tests.yml)
 [![CI Tests](https://github.com/nuxtifyts/php-dto/actions/workflows/php-tests.yml/badge.svg)](https://github.com/nuxtifyts/php-dto/actions/workflows/php-tests.yml)
-[![Test Coverage](https://raw.githubusercontent.com/nuxtifyts/php-dto/main/assets/badge-coverage.svg)](https://packagist.org/packages/nuxtifyts/phpdto)
+[![Test Coverage](https://raw.githubusercontent.com/nuxtifyts/php-dto/main/badge-coverage.svg)](https://packagist.org/packages/nuxtifyts/phpdto)
 
 This package enabled the creation of data objects which can be used in various ways. 
 Using modern PHP syntax, it allows you to hydrate data from arrays, objects, and other data sources.