Add static personal site with portfolio and GitHub Pages deploy workflow

[tryflowk]

Motivation

• Provide a simple static personal site (link-tree and portfolio) and automate publishing to GitHub Pages.
• Make it easy to run locally and document deployment steps in the repository README.md.

Description

• Add static site files: index.html, portfolio.html, and styles.css implementing a dark-themed link-tree and portfolio layout.
• Add .nojekyll to disable Jekyll processing for Pages and update README.md with local run instructions and published URLs.
• Add a GitHub Actions workflow ./github/workflows/deploy-pages.yml that packages the repository and deploys it to GitHub Pages using actions/configure-pages, actions/upload-pages-artifact, and actions/deploy-pages.

Testing

• No automated tests were added or executed for these static assets and workflow changes.

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