[fix] Add copier.yml to Copier template exclusions

[fix] Add copier.yml to Copier template exclusions

What?

The copier.yml file needs to be added to the _exclude list in the Copier template configuration to prevent it from being copied to new projects.

Why?

The copier.yml file contains template-specific configuration that should not be propagated to generated projects.

How to reproduce?

Feature: Copier Template Exclusions
  In order to prevent template configuration from being copied
  As a template maintainer
  I need to ensure copier.yml is excluded from generated projects

  Scenario: Creating a new project from template
    Given the current _exclude configuration in copier.yml:
      """
      _exclude:
          - .git
          - CHANGELOG.md
          - LICENSE
          - README.md
          - VERSION
      """
    When I generate a new project using Copier
    Then copier.yml should not be copied to the new project

Definition of Done

• Add copier.yml to the _exclude list in copier.yml
• Test project generation to verify copier.yml is not copied
• Update documentation if necessary

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Breaking change? ⚠️ No

Additional Information:

• Version: 1.0.1
• Files affected: copier.yml