revert: restore typing-svg purple title

Author: Kiky-88

README.md

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 <div align="center">
 
-<h1><img src="assets/icon.png" alt="QuantVLA Logo" width="100"> QuantVLA</h1>
+<h1><img src="assets/icon.png" alt="QuantVLA Logo" width="100">&nbsp;<img src="https://readme-typing-svg.demolab.com?font=Montserrat&weight=700&size=42&pause=99999&color=7C4DFF&center=true&vCenter=true&width=280&height=100&lines=QuantVLA" alt="QuantVLA"></h1>
 
 **Scale-Calibrated Post-Training Quantization for Vision-Language-Action Models**