feat: new GDM greeter logo

Text in logo is capitalized (YourDev instead of yourdev)
Image file is installed in /usr/share/orange-yourdev-login

images/xcf2png-all.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# taken from https://stackoverflow.com/a/5846727
+gimp -n -i -b - <<EOF
+(let* ( (file's (cadr (file-glob "*.xcf" 1))) (filename "") (image 0) (layer 0) )
+  (while (pair? file's) 
+    (set! image (car (gimp-file-load RUN-NONINTERACTIVE (car file's) (car file's))))
+    (set! layer (car (gimp-image-merge-visible-layers image CLIP-TO-IMAGE)))
+    (set! filename (string-append (substring (car file's) 0 (- (string-length (car file's)) 4)) ".png"))
+    (gimp-file-save RUN-NONINTERACTIVE image layer filename filename)
+    (gimp-image-delete image)
+    (set! file's (cdr file's))
+    )
+  (gimp-quit 0)
+  )
+EOF
+