Remove bottom border from page titles

What does this MR do and why?

• Removes bottom border from page titles to reduce number of unnecessary horizontal lines

Screenshots or screen recordings

Before	After
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How to set up and validate locally

Go to your todos/issues/MRs/etc/etc

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.