fix: modifying offset of secondary nav for edu

[stephiescastle]

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Description

Supports https://github.com/nasa-jpl/www/issues/244

Modifies secondary nav styles to have the correct offset when scrolling up (the EDU header is shorter than the main WWW header).

Instructions to test

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge

[stephiescastle]

Hmm, this fix doesn't seem to be effective anymore. I've created a new issue to capture it: https://github.com/nasa-jpl/www/issues/254