Rewrites README.md from scratch against the code on next, for #327: what pixa is and how to use it, deployment, design, the settings reference, then development and testing. The `### Configuration` heading and its one-item-per-setting list stay as TestReadmeNamesEverySetting reads them. Rework after review: all 38 findings of #345 (comment) are addressed, the decode and encode times are restored, and 13 further sentences were fixed in a full pass. Model: fable-5-1
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