make docker hub username configurable

[bniladridas]

Summary

• Make Docker Hub username configurable instead of hardcoded 'harpertoken'

[gemini-code-assist]

Summary of Changes

Hello @bniladridas, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the initial Mac setup experience by introducing greater flexibility for Docker Hub authentication and integrating a new utility for system maintenance. Users can now specify their own Docker Hub username during login, moving away from a fixed default. Additionally, the setup script now includes the installation of 'mole', a comprehensive tool designed for deep cleaning and optimizing macOS systems, with corresponding documentation added to the project's README.

Highlights

• Configurable Docker Hub Username: The Docker Hub login process in the setup-mac.sh script has been updated to prompt the user for their Docker Hub username, removing the previously hardcoded 'harpertoken' username.
• Mole Tool Integration: The mole system optimization tool is now installed as part of the initial Mac setup script, enhancing system cleaning and optimization capabilities.
• README Documentation Update: The README.md file has been updated to include a new section detailing the mole tool, its purpose, and various commands, as well as adding it to the list of tools installed during initial setup.

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[gemini-code-assist]

Code Review

This pull request successfully makes the Docker Hub username configurable during the setup process, removing the hardcoded 'harpertoken' value. The changes also include adding the 'mole' tool to the setup script and documenting it in the README. My review includes a high-severity security suggestion to handle the Docker Hub token more securely and a medium-severity correction for the updated documentation.

[bniladridas]

This PR closes #37 as well.