Add documentation URL to pyproject.toml and use it in tool.xml

[johnwduggan]

Summary of Changes

This adds the ability to specify a documentation URL in pyproject.toml that integrates with nova-trame and nova-dashboard to display the URL to users.

We could consider automatically creating tool documentation links that point to https://ndip.ornl.gov/docs/user_guide/tools/, but I'm not sure if this is what we want. Would be interested to hear your thoughts on this subject!

Checklist

• The PR has a clear and concise title
• Code is self-documented and follows style guidelines.
• Automated tests are written and pass successfully.
• Regression tests (e.g. manually triggered system tests, manual GUI/tool tests, ...) are performed to make sure the PR does not break anything (when applicable)
• Readme file is present and up-to-date.

Documentation Updates

Additional Notes