Update README with gif

Added a new gif to the README for better visualization.

Author: vladdez

README.md

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 # ERPExplorer.jl
 Repository for interactive EEG/ERP/rERP visualization tool based on WGLMakie.jl
 
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 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://s-ccs.github.io/ERPExplorer.jl/dev)
 
-<img src="https://github.com/user-attachments/assets/59dec7c8-ebb9-4bd1-af55-a50c95709411" alt="image" height="300">
+<img src="https://github.com/user-attachments/assets/c0d26780-0750-436f-940b-0b489b88e198" height="300">
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