docs: add pubky icon to the readme

.img/pubky-logo.svg

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README.md

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-# Pubky
+<h1 align="center"><a href="https://pubky.org/"><img alt="pubky" src="./.img/pubky-logo.svg" width="100" /></a></h1>
 
 > The Web, long centralized, must decentralize; Long decentralized, must centralize.