feat: add initiatives page hero

[ncarazon]

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🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-5183-feat-initiatives-page-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:feat-initiatives-page-c09b2f8
🗄️ PostgreSQL	NeonDB branch preview/pr-5183-feat-initiatives-page
⚡ Redis	Fly Redis mtc-redis-pr-5183-feat-initiatives-page

Details

• Commit: 598f09b241cd9aa2e8122ffe3d799a998474ccbf
• Branch: feat/initiatives-page
• Fly App: metaculus-pr-5183-feat-initiatives-page

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