docs: Hugo theme May update (cherrypick)

[Jcahilltorre]

Proposed changes

This MR updates the F5-hugo theme with the May improvements:

• Better TOC behavior, smooth scrolling

• Style updates needed for new products.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [ x] I have read the CONTRIBUTING doc
• [ x] I have added tests that prove my fix is effective or that my feature works
• [ x] I have checked that all unit tests pass after adding my changes
• [ x] I have updated necessary documentation
• [ x] I have rebased my branch onto main
• [ x] I will ensure my PR is targeting the main branch and pulling from my branch from my own fork