add ghostty config and theme

configs/ghostty_g/themes/UltraDark

@@ -0,0 +1,21 @@
+palette = 0=#000000
+palette = 1=#f07178
+palette = 2=#c3e88d
+palette = 3=#ffcb6b
+palette = 4=#82aaff
+palette = 5=#c792ea
+palette = 6=#89ddff
+palette = 7=#cccccc
+palette = 8=#333333
+palette = 9=#f6a9ae
+palette = 10=#dbf1ba
+palette = 11=#ffdfa6
+palette = 12=#b4ccff
+palette = 13=#ddbdf2
+palette = 14=#b8eaff
+palette = 15=#ffffff
+background = 000000
+foreground = ffffff
+cursor-color = fefefe
+selection-background = 222222
+selection-foreground = cccccc