Add CFF citation support and contribution instructions

[jo-mueller]

Added metadata to the jupyter book myst.yml that contains everything that's necessary to generate a CITATION.cff metadata. Whenever a new contributor opens aPR to this repo, they should add their data to the authors section in the myst.yml. A citation.cff can then be built when someone makes their first contribution.

May supersede ome/ngff#175?

Long Copilot description

This pull request introduces improvements to citation metadata, author attribution, and documentation formatting for the NGFF specification project. The main changes include adding a standardized CITATION.cff file, updating the project metadata in myst.yml to support citation export, and ensuring consistent author information across documentation and auto-generated files. Additionally, the contribution guide now instructs new contributors on how to add themselves as authors and update citation metadata.

Citation and Metadata Improvements

• Added a comprehensive CITATION.cff file to ngff_spec/, including project abstract, keywords, license, repository links, and preferred citation details for the NGFF specification and related publications.
• Updated ngff_spec/myst.yml to include a cff export configuration, embedding citation metadata for software and articles, and listing author and publication identifiers.

Author Attribution and Contribution Process

• Enhanced the contribution guide in ngff_spec/contribute.md to instruct first-time contributors on adding themselves to the author list in myst.yml and on rebuilding the CITATION.cff file as part of the PR workflow.
• Standardized author metadata in documentation and auto-generated markdown files, including examples.md, schemas.md, and files generated by pre_build.py. [1] [2] [3] [4] [5] [6] [7]

Documentation Formatting

• Converted several documentation files (citing.md, contribute.md, examples.md, schemas.md, version_history.md) to use YAML front matter for improved consistency and compatibility with Jupyter Book and MyST Markdown. [1] [2] [3] [4] [5]

These changes streamline citation management, improve contributor recognition, and ensure consistent formatting across the NGFF specification documentation.

[github-actions]

Automated Review URLs

• Readthedocs