Make image sizes relative

README.md

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 Sailfin is a [Sailfish OS](https://sailfishos.org) client for [Jellyfin](https://jellyfin.org), a media server, written in C++ and qml.
 
 ## Screenshots (running on Sailfish OS)
-<img alt="Screenshot showing the library root" src="graphics/screenshot-sailfish-1.png" width="225" height="400" /> <img alt="Screenshot showing TV show page" src="graphics/screenshot-sailfish-2.png" width="225" height="400" /> <img alt="Screenshot showing the video player" src="graphics/screenshot-sailfish-3.png" width="400" height="225" />
+<img alt="Screenshot showing the library root" src="graphics/screenshot-sailfish-1.png" width="33%" /> <img alt="Screenshot showing TV show page" src="graphics/screenshot-sailfish-2.png" width="33%" /> <img alt="Screenshot showing the video player" src="graphics/screenshot-sailfish-3.png" width="33%" />
 
 ## License
 This application is licensed under the LGPLv2.1 license, although you may opt to choose a newer version of the LGPL if you want so.