Update readme

Author: smjonas

README.md

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 Text editing in Neovim with immediate visual feedback: view the effects of any command on your buffer contents live. Preview macros, the `:norm` command & more!
 
-<div align="center">
-  <video alt="live-command demo video" src="https://user-images.githubusercontent.com/40792180/194180320-691efe71-0743-40e5-b0d7-454f142a9235.mp4"></video>
-</div>
+!![live-command demo video](https://user-images.githubusercontent.com/40792180/235201812-adc95327-65cc-4ae4-8c2e-804853dd0c02.gif)
 <p><sub>Theme: <a href="https://github.com/folke/tokyonight.nvim">tokyonight.nvim</a></sub></p>
 
 ## :sparkles: Motivation and Features