Restructured doc, improved test #51

Job	Run time
PHP 7.4 Fixer with lowest deps	1m 7s
PHP 7.4 tests with lowest deps	2m 18s
PHP 8.0 Fixer	1m 3s
PHP 8.0 tests	2m 23s
PHP 8.1 Fixer with Symfony ^6	1m 11s
PHP 8.1 tests with Symfony ^6	2m 40s
PHP 8.2 Fixer	1m 9s
PHP 8.2 tests	2m 45s
PHP 8.3 Fixer	1m 19s
PHP 8.3 tests	2m 36s
PHP 8.3 Fixer with migration rules	2m 7s
PHP 8.3 tests with migration rules	3m 36s
PHP 8.3 Fixer with Symfony ^7	1m 12s
PHP 8.3 tests with Symfony ^7	4m 54s
PHP 8.3 code coverage	4m 19s
PHP 8.3 Fixer on Windows	2m 28s
PHP 8.3 tests on Windows	2m 10s
PHP 8.3 Fixer on macOS	2m 47s
PHP 8.3 tests on macOS	1m 44s
PHP 8.4 Fixer	1m 14s
PHP 8.4 tests	3m 18s
Deployment checks	0s
	48m 20s

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