add ghostty config and theme

configs/ghostty_g/themes/Builtin Light

@@ -0,0 +1,21 @@
+palette = 0=#000000
+palette = 1=#bb0000
+palette = 2=#00bb00
+palette = 3=#bbbb00
+palette = 4=#0000bb
+palette = 5=#bb00bb
+palette = 6=#00bbbb
+palette = 7=#bbbbbb
+palette = 8=#555555
+palette = 9=#ff5555
+palette = 10=#55ff55
+palette = 11=#ffff55
+palette = 12=#5555ff
+palette = 13=#ff55ff
+palette = 14=#55ffff
+palette = 15=#ffffff
+background = ffffff
+foreground = 000000
+cursor-color = 000000
+selection-background = b5d5ff
+selection-foreground = 000000