Different cursor for clickable-header class

[alkaliphile]

When clicking on text that has the default text cursor, I don't expect the page to scroll. Changing the cursor to a pointer for this clickable-header class would provide a better user experience.

[thelinuxfoundation]

Thank you for your pull request. Before we can look at your contribution, we need to ensure all contributors are covered by a Contributor License Agreement.

After the following items are addressed, please respond with a new comment here, and the automated system will re-verify.

• User @alkaliphile isn't covered by a CLA. They will need to complete the form at https://identity.linuxfoundation.org/projects/cncf

Regards, CLA GitHub bot

[alkaliphile]

I've completed the CLA form.

[hsaliak]

That's definitely a nice UX improvement, thanks for making it!