dev/v0.1.4: add GitHub Pages documentation workflow

[NanoBiostructuresRG]

Summary

This PR prepares HDDFlyzer v0.1.4 as the documentation web / GitHub Pages readiness cycle.

Changes

• Added a dedicated GitHub Actions workflow for MkDocs documentation validation and GitHub Pages deployment.
• Validates documentation with mkdocs build --strict.
• Keeps deployment restricted to pushes on main.
• Added/updated v0.1.4 documentation metadata.
• Updated package version metadata to 0.1.4.
• Updated citation, changelog, roadmap, README, and MkDocs configuration.
• Added site_url for the GitHub Pages site.
• Preventively constrained MkDocs to <2.0 in the documentation optional dependencies.

Validation

• CI passed on dev/v0.1.4.
• Docs workflow passed on dev/v0.1.4.
• Local validation reported:
  • python -m mkdocs build --strict OK
  • python -m pytest tests -q OK, 290 passed, 1 skipped
  • python -m build OK
  • package/import version reports 0.1.4
  • git diff --check OK

Notes

• This PR does not publish to PyPI.
• GitHub Pages deployment is expected only after merge to main.
• No scientific logic, pipeline behavior, outputs, or runtime API behavior were changed.