Refactor mongo-seed to only use Dockerfile and remove service from docker-compose

[keshav2010]

We have a "mongo-seed" service defined in the docker-compose.yml file, which is responsible for populating/seeding the MongoDB container with sample data available in the mongo-seed/*.json files.

Changes are required as follows:

1. Remove the mongo-seed service from docker-compose.yml and define it solely in its respective Dockerfile (present in the mongo-seed/Dockerfile directory).
2. Modify the preparedb block in the Makefile to perform the import activity.

Another alternative could be to use some init script in Golang/Mongosh's JavaScript that performs this activity.

Both solutions are welcome.

[w3tsa]

I have created a PR for this: Changes Made