updated added prerequisites to the practice and concepts V3 #421

[rakshitdabral]

gave prerequisites to practice while removing all the topics also added slag to concepts

[kytrinyx]

Thank you so much for taking the time to do this work.

From the documentation (https://exercism.org/docs/building/tracks/practice-exercises)

The practices key should list the slugs of Concepts that this Practice Exercise actively allows a student to practice.

The prerequisites key lists the Concepts that a student must have completed in order to access this Practice Exercise.

Since this track only has one wip concept, we can't merge this yet. I'm going to put it on hold so that we can bring in these values if and when concepts do get implemented.