add ghostty config and theme

configs/ghostty_g/themes/iceberg-light

@@ -0,0 +1,21 @@
+palette = 0=#dcdfe7
+palette = 1=#cc517a
+palette = 2=#668e3d
+palette = 3=#c57339
+palette = 4=#2d539e
+palette = 5=#7759b4
+palette = 6=#3f83a6
+palette = 7=#33374c
+palette = 8=#8389a3
+palette = 9=#cc3768
+palette = 10=#598030
+palette = 11=#b6662d
+palette = 12=#22478e
+palette = 13=#6845ad
+palette = 14=#327698
+palette = 15=#262a3f
+background = e8e9ec
+foreground = 33374c
+cursor-color = 33374c
+selection-background = 33374c
+selection-foreground = e8e9ec