fix: resolve registry image conflict in docker-compose (#114)

Issue: links directive was failing on podman

- Removed unsupported 'links' directive for Podman compatibility

<!-- Provide a brief summary of your changes -->
It was failing on Podman because Podman doesn't support the links
directive that Docker Compose does, and we already using depends_on,
which establishes the dependency relationship between services; we can
simply remove the links section from your docker-compose.yml file.

## Motivation and Context
docker-compose -links deprecated #107
Fix the defect by removing link.

## How Has This Been Tested?
Yes. Test by running on both.
For Docker run.
docker build -t registry .
docker compose up

For Podman
podman build -t registry .
podman compose up

## Breaking Changes
Yes for podman.

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ x] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ x] My code follows the repository's style guidelines
- [ x] New and existing tests pass locally
- [ x] I have added appropriate error handling
- [x ] I have added or updated documentation as needed

## Additional context
It is related to issue #107

Co-authored-by: Avinash Sridhar <sridharavinash@users.noreply.github.com>
Co-authored-by: adam jones <domdomegg+git@gmail.com>

docker-compose.yml

@@ -4,8 +4,6 @@ services:
     container_name: registry
     build:
       dockerfile: Dockerfile
-    links:
-      - mongodb
     depends_on:
       - mongodb
     environment: