add button role styling and new register button

[kjaymiller]

Type of Change

• Bug fix 🐞
• New feature/page
• Documentation update
• Other

Description 📋

This PR does three things:

• Adds a register button that takes to you the leadership summit registration page.
• Adds css for secondary and outline and contrast buttons when <a role="button"></a> is used
• removes the "free section" the button mentions "register for free" so no need for another section about it.

Checklist ✅

• Followed the Code of Conduct and Contribution Guide
• Ran pre-commit run --all
• All tests pass locally
• Added tests (if applicable)
• Documentation updated (if applicable)

Additional Notes & Screenshots

Add any additional notes or comments that might be helpful for the reviewers.

[Copilot]

Pull request overview

This pull request updates the Leadership Summit 2026 event page to emphasize registration with a new “Register for FREE!” call-to-action, and expands the site’s button styling to support additional visual variants when using anchor elements with role="button".

Changes:

• Add a new registration button and adjust the PyOhio button styling/placement on the Leadership Summit 2026 event page.
• Add CSS “color variant” styles (primary, secondary, contrast, outline) for a[role="button"] (and .btn) in the main stylesheet.
• Remove the “How much is it?” free section and tweak livestream wording on the event page.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
uv.lock	Removes the prerelease-mode lock option section.
events/leadership-summit-2026-ohio.md	Adds registration CTA and removes redundant “Free” section content.
assets/css/bpd.css	Introduces button variant styling for a[role="button"] and .btn.

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