Enable code highlighting in the docs

[uglide]

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[Copilot]

Pull Request Overview

This PR enables code highlighting functionality in the documentation by adding PyMdown Extensions to the MkDocs configuration and standardizing dependency management across different deployment environments.

• Added markdown extensions for syntax highlighting, code snippets, and enhanced formatting
• Consolidated dependencies into a centralized requirements.txt file
• Updated Docker and GitHub Actions workflows to use the new requirements file

Reviewed Changes

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

File	Description
mkdocs.yml	Added markdown extensions for code highlighting and enhanced formatting features
docs/requirements.txt	Created centralized dependency list with version constraints
docs/Dockerfile	Refactored to use requirements.txt instead of individual pip installs
.github/workflows/docs.yml	Updated to install dependencies from requirements.txt

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