add ghostty config and theme

configs/ghostty_g/themes/niji

@@ -0,0 +1,21 @@
+palette = 0=#333333
+palette = 1=#d23e08
+palette = 2=#54ca74
+palette = 3=#fff700
+palette = 4=#2ab9ff
+palette = 5=#ff50da
+palette = 6=#1ef9f5
+palette = 7=#ddd0c4
+palette = 8=#515151
+palette = 9=#ffb7b7
+palette = 10=#c1ffae
+palette = 11=#fcffb8
+palette = 12=#8efff3
+palette = 13=#ffa2ed
+palette = 14=#bcffc7
+palette = 15=#ffffff
+background = 141515
+foreground = ffffff
+cursor-color = ffc663
+selection-background = 515151
+selection-foreground = ffc663