Create different fallback OG images for different subpages

[Y3drk]

Goal

• Increase the fallback OG image relevancy by making it different for different subpages (ex. different fallback images for App Details, Protocol Details pages)
• Transfer the responsibility of handling the undefined OG image paths from ensawards.org\src\layouts\Layout.astro to appropriate helper functions.

Additional info

• Remains a fairly low priority as the current fallback system is working
• Related discussion on GitHub

[coderabbitai]

🔗 Related PRs

#178 - chore: Add OG images for SSV DAO [merged]

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