Add Ethdenver 2022

[netlify[bot]]

✔️ Deploy Preview for substrate-website ready!

🔨 Explore the source changes: 14c9ce0f21f7ca9b1d07c2080a1530ccfd7b6337

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😎 Browse the preview: https://deploy-preview-206--substrate-website.netlify.app/ecosystem/opportunities/hackathons

[rmnprkrl]

nice! (open next time on main branch with content contribution thx)