Delete outdated Deployer releases
Deployer currently keeps 10 releases of every site. Please change this to a lower value. I would say that 2 should be enough...
https://git-t3o.typo3.org/t3o/typo3.org/blob/develop/.gitlab-ci/deployer/deploy.php#L55
Make sure to apply the same change for any other sites (ter, my, etc.)