Display message when not adding www redirection

EasyEngine adds www redirections(`www.example.com` -> `example.com` or vice-versa) only if it finds that domain with www is pointed to the server. The reason for doing so is that to add https redirect from `www.example.com -> example.com`, we need a cert that is valid for both domains `www.example.com` and `example.com`. And to get that certificate, we need to ensure www is pointed to the server.

This leads to confusion among users who find that sometimes the redirection file is added, while sometimes it is not - https://community.easyengine.io/t/ee-site-create-503-service-temporarily-unavailable/12032

Solution to this issue is:
1. Always add HTTP www redirection
2. If the site has SSL and www domain is pointed, add https www redirection
3. If the site has SSL and www domain is not pointed, show a message on the user's screen that https redirection is not added as the domain is not pointed. Also, add a similar message as comment in the redirection config file.

Aucun fichier ni test n’est indiqué dans l’issue. Commencez par suivre les chemins de redirection www et SSL ainsi que la génération de configuration de la commande site-create. Le travail est terminé lorsque la redirection HTTP de www est toujours ajoutée, que la redirection HTTPS dépend de SSL et du fait que DNS pointe correctement, et que le message indiquant l’absence de redirection apparaît à l’écran ainsi que dans le commentaire de configuration.

Rédigé par le modèle d'indexation à partir du texte de l'issue.