`accumulate`, `octal`, and `trinary` are deprecated in problem-specifications

[BNAndras]

These three exercises are deprecated. The recommendation is that instead ofaccumulate, tracks implement list-ops and instead of octal and trinary, tracks implement all-your-base. Therefore, those two exercises should be added to the track, and then the three deprecated exercises can be marked as such in the track config.

Accumulate https://github.com/exercism/problem-specifications/blob/main/exercises/accumulate/.deprecated

Octal https://github.com/exercism/problem-specifications/blob/main/exercises/octal/.deprecated

Trinary https://github.com/exercism/problem-specifications/blob/main/exercises/trinary/.deprecated