docs: recommend pre-built image deployments for production

[githubsaturn]

Summary

Keeps the existing simple source deployment as the first Quick Start, while clearly explaining its server resource cost.

The README now recommends building and pushing a Docker image in GitHub Actions for production deployments so the CapRover server does not spend CPU, memory, disk I/O, and storage on image builds.

Changes

• Keep the simple source deployment first in the README
• Add a concise resource-consumption warning directly below it
• Recommend pre-built image deployment for production workloads
• Explain that image builds then run on GitHub Actions instead of the CapRover server
• Preserve the existing section order and action behavior

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 058a3e0 and 71adc62.

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• README.md

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