Meteor Collection2 Core

## Overview
The aldeed:collection2-core package provided essential functionality for data validation in Meteor applications, but it has recently been integrated into the main aldeed:collection2 package as version 3.0.0. This integration streamlines the collection management process by consolidating resources and reducing fragmentation, making it easier for developers to implement data validation in their projects without the need for separate packages.

The transition to the newer version marks a significant development in the Meteor ecosystem, encouraging users to utilize the primary repository for all future issues and pull requests. This change aims to provide a more cohesive experience for developers, ensuring that they have access to the latest features and improvements in one centralized location.

## Features
- **Seamless Integration**: Merged into the main aldeed:collection2 package, simplifying maintenance and usage for developers.
- **Enhanced Data Validation**: Provides robust validation features for collections, ensuring integrity and consistency of data.
- **Active Development**: Encourages community contributions and support through the main repository, fostering a collaborative environment.
- **Updated Documentation**: Comprehensive and up-to-date resources available to help developers understand the new structure and features.
- **Issue Tracking**: Existing issues can still be referenced in the old repository, while new issues are encouraged to be created in the main repository for better tracking.