Minor fixes

[melekderman]

Summary of changes

This pull request makes several updates across documentation, project metadata, and CI configuration. The main changes include updating author and maintainer information, revising project descriptions and URLs, improving documentation badges, and adjusting the Python version matrix for unit tests.

Project metadata and documentation updates:

• Added "Melek Derman" to both the authors and maintainers lists in pyproject.toml. [1] [2]
• Changed project description and keywords in pyproject.toml from "neutron transport" to "radiation transport" for broader accuracy.
• Updated project URLs in pyproject.toml to point to the new mcdc-project/mcdc GitHub organization and improved documentation links.
• Improved badges in README.md: added a Docker workflow badge.
• Updated instructions in tools/data_library_generator/README.md to remove ACEtk from the default pip install command and added guidance for installing ACEtk from source.

Continuous Integration configuration:

• Modified the GitHub Actions workflow in .github/workflows/unit_test.yml to test only against Python 3.13, removing 3.10 from the matrix.

Types of changes

• Organization and beautification (changes which improve readability and/or accessibility)

Developer Checklist

• I have read the contributing guide.
• My code follows the code style of this project.
• All new and existing tests pass