When turning Cypress off, it will now also remove the container by using down instead of stop

- PHP >= 8.1
- Composer >= 2
Code cleanup

#65 Add support for symfony mailer as a replacement for the smtp module

#63 Ensure templated files are writeable and set them read-only afterwards if they don't go into git, as they will be overwritten next time

#63 Ensure templated files are writeable and set them read-only afterwards if they don't go into git, as they will be overwritten next time