use markdown format for image

Author: yggverse

README.md

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 # Yoda - Browser for [Gemini protocol](https://geminiprotocol.net)
 
-<img src="https://raw.githubusercontent.com/YGGverse/Yoda/refs/heads/master/data/io.github.yggverse.Yoda.svg" alt="Yoda browser logo" width="160">
+![Yoda browser logo](https://raw.githubusercontent.com/YGGverse/Yoda/refs/heads/master/data/io.github.yggverse.Yoda.svg)
 
 Privacy-oriented GTK 4 / Libadwaita client written in Rust.