Restore Images in Restore Script

[harshkhandeparkar]

The restore-from-backup.sh script only restores the database backup. Add the following:

1. A condition to check if the backup includes an images/ folder (it may not)
2. If the files exist copy them inside the mediawiki container's /srv/static/
3. Execute chown -LR www-data:www-data /srv/static/images inside the container