feat: Migrate exercise to issue-based flow

[chriswblake]

This pull request introduces several changes aimed at improving the repository's configuration, streamlining workflows, and enhancing the developer experience. Key updates include the addition of a .coveragerc file for test coverage configuration, the creation of a development container setup, and the replacement of outdated GitHub Actions workflows with new ones tailored for Python projects.

Configuration Improvements:

• .coveragerc: Added a [run] section with relative_files = True to configure test coverage reporting.
• .devcontainer/devcontainer.json: Introduced a development container configuration for Python 3.13, including setup commands for dependencies and tools like pytest and coverage.

Workflow Enhancements:

• .github/steps/1-step.md: Added instructions for setting up continuous integration using GitHub Actions workflows for Python projects.
• .github/steps/2-step.md: Provided detailed guidance on creating workflows for testing and coverage reporting, including examples and best practices.
• .github/steps/3-step.md: Included steps for triggering workflows via pull requests and proposing code changes.

Cleanup and Removal:

• .github/dependabot.yml: Removed the configuration for Dependabot updates for GitHub Actions, as it is no longer needed.
• .github/script/merge-branch.sh: Deleted a script for merging branches, likely due to changes in workflow or repository management practices.
• .github/steps/-step.txt, .github/steps/0-welcome.md, .github/steps/1-add-a-test-workflow.md, .github/steps/2-fix-the-test.md, .github/steps/3-upload-test-reports.md, .github/steps/4-add-branch-protections.md: Removed outdated or redundant documentation and steps related to workflows and repository setup. [1] [2] [3] [4] [5] [6]

[chriswblake]

Migration is on pause until further notice. You are welcome to take the skills-dev version at:
https://github.com/skills-dev/test-with-actions