Adds b13/container and ssch/typo3-encore as the base for the theme,
typo3/cms-redirects for the existing sys_redirect records and
typo3/cms-lowlevel. Rector and Fractor are configured for the
TYPO3 10 to 13 migration of the packages.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
