Merge pull request 'Add a pointer cursor when hovering a GraphNode' (#13) from vo/graph-node-cursor into master

Reviewed-on: https://gitea.ks.matfyz.cz/KSP/graf-uloh/pulls/13

frontend/src/GraphNode.svelte

@@ -34,6 +34,9 @@
 </script>
 
 <style>
+  g {
+    cursor: pointer;
+  }
   g:hover > ellipse {
     fill: #ffb3a2
   }