Update site github action workflow

[arash77]

Closes #610
This pull request introduces a new workflow for deploying documentation and includes a script to generate HTML documentation from the README.md file. The most important changes are the addition of a GitHub Actions workflow, the creation of a Python script for generating documentation, and the inclusion of necessary dependencies.
It should also be added to the GitHub Pages setting to use the gh-pages branch as the source.

Documentation Deployment:

• .github/workflows/update-site.yml: Added a GitHub Actions workflow to deploy documentation to GitHub Pages on pushes to the main branch that affect the README.md file. This workflow checks out the repository, sets up Python, installs dependencies, generates documentation, and deploys it to GitHub Pages.

Documentation Generation:

• docs/src/generate_docs.py: Added a Python script that converts the README.md file to HTML using pycmarkgfm and BeautifulSoup, and structures the HTML for deployment.

Dependencies:

• docs/src/requirements.txt: Added pycmarkgfm and beautifulsoup4 as dependencies for the documentation generation script.