* more precision in the website name, add the author of the course for 'Développement Web - Administration Réseau'
* replace title by 'Tutoriel PHP', add website name and translator for 'Tutoriel HTML'
* add website name and translator for 'Tutoriel CSS' and 'Tutoriel HTML'
* add website name and author for 'Linux et Ubuntu - Administration Réseau'
* tweaks according to review
---------
Co-authored-by: Mamadou443 <mamadou@y13>