Moved MJML generation to the Dockerfile

[hlbmtc]

closes #4285
closes #1589

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[github-actions]

🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4433-feat-1589-mjml-docker-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:feat-1589-mjml-docker-9bf1caa
🗄️ PostgreSQL	NeonDB branch preview/pr-4433-feat-1589-mjml-docker
⚡ Redis	Fly Redis mtc-redis-pr-4433-feat-1589-mjml-docker

Details

• Commit: 9bf1caaa29c81b5d83530d65f7354df26993cf35
• Branch: feat/1589-mjml-docker
• Fly App: metaculus-pr-4433-feat-1589-mjml-docker

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ℹ️ Preview Environment Info

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