Unified documentation structure for libraries

[AndrewSazonov]

To enhance consistency and usability across EasyScience-based data analysis libraries, the documentation structure is standardized with the following main sections:

• Introduction – Provides a description of PROJECT_NAME, including its purpose, licensing, latest release details, and contact information.
• Installation & Setup – Guides users through system requirements, environment configuration, and the installation process.
• User Guide – Covers core concepts, key terminology, workflow steps, and essential parameters for effective use of PROJECT_NAME.
• Tutorials – Offers practical, step-by-step examples demonstrating common workflows and data analysis tasks.
• API Reference – An auto-generated reference detailing the available functions and modules in PROJECT_NAME.

A documentation skeleton is included in the Copier templates:
https://github.com/easyscience/templates/tree/master/template/docs

A CI workflow for building documentation via GitHub Actions (also included in the Copier templates):
https://github.com/easyscience/templates/blob/master/template/.github/workflows/docs.yml.jinja

A guide on how to build and check the documentation locally:
https://github.com/easyscience/templates/blob/master/README.md

Example of a generated documentation skeleton:
https://easyscience.github.io/peasy-lib

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Links to the original discussions: #24