use actual url

README.md

 # Ephemeral
 
 <p align="center">
-<img src="/docs/logos/favicon512.png"/>
+<img src="https://git.volkor.me/Volkor/Ephemeral/src/branch/main/docs/logos/favicon512.png"/>
 </p>
 
 This is the repository for a *ephemeral* file hosting server. It receives files and serves them on request. After a while it decides to delete them. That's it!