Update package metadata and Read the Docs build configuration

[kampersanda]

This PR updates:

• the package metadata for pypi release, and
• Read the Docs configuration so the documentation build can install and build the project correctly,

while updating the version to 0.2.3.

[Copilot]

Pull request overview

This PR updates release/package metadata and Read the Docs build settings so the PyO3/maturin-backed Python package can be built and documented correctly for version 0.2.3.

Changes:

• Adds PyPI metadata and documentation extras to pyproject.toml.
• Bumps the Cargo/package version to 0.2.3.
• Updates Read the Docs to use the correct Sphinx config path, modern build image/toolchains, and install docs extras.

Reviewed changes

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

File	Description
pyproject.toml	Adds package description, README, classifiers, and docs optional dependencies.
Cargo.toml	Bumps the package version from 0.2.2 to 0.2.3.
.readthedocs.yaml	Configures the docs build environment and installs the project with docs extras.

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[vbkaisetsu]

https://app.readthedocs.org/projects/python-vibrato/builds/32915760/