Add support for transparent nav bar

[natemoo-re]

• Adds a transparent style navbar
• Updates the /db page to use it
• Updates the /db page to improve hero image loading experience

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
astro-build	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 5, 2024 10:53pm