Optimize sdist Build Size and Improve Documentation

[mdapena]

Initial Checks

• The code compiles successfully without any errors or warnings.
• I have personally tested these changes on my local environment.
• I have ensured that relevant documentation has been added or updated.
• I adhere to the project structure and code standards defined in the documentation.
• My code follows the established coding style guidelines.
• I have added tests for the new code (if applicable).
• All existing tests have passed successfully.

Description

This PR focuses on optimizing the sdist build size and improving the documentation.

• Optimized the size of the sdist build by including only essential files and directories, such as /src, /tests, .gitignore, pyproject.toml, CITATION.cff, README.md, and LICENSE.
• Refactored the dependencies of the docs environment by separating them into an optional dependency called docs.
• Updated the deploy-docs.yml GitHub workflow to utilize the new docs optional dependency.
• Updated the EventEmission class with the @final decorator from the typing module, indicating that it is meant for internal use only and should not be subclassed.
• Addressed minor errors and fixed broken links in the documentation.