add ghostty config and theme

configs/ghostty_g/themes/iceberg-dark

@@ -0,0 +1,21 @@
+palette = 0=#1e2132
+palette = 1=#e27878
+palette = 2=#b4be82
+palette = 3=#e2a478
+palette = 4=#84a0c6
+palette = 5=#a093c7
+palette = 6=#89b8c2
+palette = 7=#c6c8d1
+palette = 8=#6b7089
+palette = 9=#e98989
+palette = 10=#c0ca8e
+palette = 11=#e9b189
+palette = 12=#91acd1
+palette = 13=#ada0d3
+palette = 14=#95c4ce
+palette = 15=#d2d4de
+background = 161821
+foreground = c6c8d1
+cursor-color = c6c8d1
+selection-background = c6c8d1
+selection-foreground = 161821