add grub backgrounds

www/grub/COPYING

@@ -0,0 +1,3 @@
+The deer logo for Libreboot is opyright 2014 Marcus Moeller and released under
+CC-0: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+The grey backgrounds with it were made by Leah Rowe in 2016, also CC-0

www/grub/logo.svg

@@ -0,0 +1,5 @@
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+ <g transform="translate(-244 -370)">
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