Update FUNDING.yml

By moving the site to Firebase to let anyone upload icons, regardless of their GitHub knowledge, some costs are involved. This won't be much, all I hope is to cover the server costs. I'll be as transparent as I can and will be posting the billing costs at the end of each month in here

.github/FUNDING.yml

@@ -1,6 +1,6 @@
 # These are supported funding model platforms
 
-github: @elrumo
+github: elrumo
 patreon: # Replace with a single Patreon username
 open_collective: # Replace with a single Open Collective username
 ko_fi: # Replace with a single Ko-fi username