Removed references to mcrypt

[snipe]

mcrypt has been deprecated for quite some time. This removes the final vestigial references.

[what-the-diff]

PR Summary

• Removal of outdated 'mcrypt' references in the Docker setup
  The old and no longer supported 'mcrypt' commands have been removed from the Docker setup instructions.

• Deletion of 'RecryptFromMcrypt' file
  The file responsible for re-encrypting data from the outdated 'mcrypt' format has been removed.

• Removal of redundant encryption classes
  The outdated encryption classes (BaseEncrypter and McryptEncrypter) that utilized 'mcrypt' have been deleted.

• Updating of 'snipeit.sh' script
  The shell script snipeit.sh has been updated to get rid of traces of 'php8.2-mcrypt', aligning with the removal of the 'mcrypt'.