placeholder - updated navigation in header

[RichardJamesLopez]

This pr is a placeholder for a set of previous changes that slipped in w/o a pr.

The changes were:

• updated navigation for header to be reinstated for category pages
• cleaned up the initial activities page
• edited title for activities to be uniform w/ other types

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Name	Status	Preview	Updated (UTC)
app-nesting	✅ Ready (Inspect)	Visit Preview	Jan 3, 2024 0:17am