split requirements

[sahiljhawar]

fixes #14

[Copilot]

Pull Request Overview

This PR splits documentation requirements from the main project requirements by creating a separate requirements file for documentation dependencies and configuring the project to use optional dependencies.

• Creates a dedicated docs/requirements.txt file containing Sphinx and documentation-related dependencies
• Updates pyproject.toml to define optional documentation dependencies referencing the new file
• Updates ReadTheDocs configuration to use the new documentation requirements file

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Adds optional-dependencies configuration for docs and minor formatting fixes
docs/requirements.txt	New file containing documentation-specific dependencies
.readthedocs.yaml	Updates requirements path to use the new docs requirements file

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