This README would normally document whatever steps are necessary to get the application up and running.
Try with image optimization. try with base 64. try with cache. try with lazyloading async.
Things you may want to cover:
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Ruby version
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System dependencies
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Configuration
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Database creation
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Database initialization
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How to run the test suite
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Services (job queues, cache servers, search engines, etc.)
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Deployment instructions
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...