use absolute URL for image in README

README.md

@@ -4,7 +4,7 @@
 
 ## Introduction
 
-<img align="right" width="300" src="src/artwork/artwork.svg" />
+<img align="right" width="300" src="https://edugit.org/auglement/augmentile/-/raw/master/src/artwork/augmentile.svg" />
 
 Aug\[m\]entile is a Matrix-based tile map game player, meaning that
 it uses [Matrix](https://matrix.org) rooms as backend for players