README update

README.md

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 Marionette lets you freely move Reachy Mini's head while the motors are relaxed, record its
-encoder-based motion plus optional audio, and replay every take. The app can manage multiple local
-datasets—pick an existing folder or create a new one directly from the GUI—and stores each move in
+ motion plus audio, and replay every take. The app can manage multiple local
+datasets and stores each move in
 Reachy Mini's emotions schema (JSON + WAV), ready to upload to Hugging Face.