add ghostty config and theme

configs/ghostty_g/themes/C64

@@ -0,0 +1,21 @@
+palette = 0=#090300
+palette = 1=#883932
+palette = 2=#55a049
+palette = 3=#bfce72
+palette = 4=#40318d
+palette = 5=#8b3f96
+palette = 6=#67b6bd
+palette = 7=#ffffff
+palette = 8=#000000
+palette = 9=#883932
+palette = 10=#55a049
+palette = 11=#bfce72
+palette = 12=#40318d
+palette = 13=#8b3f96
+palette = 14=#67b6bd
+palette = 15=#f7f7f7
+background = 40318d
+foreground = 7869c4
+cursor-color = 7869c4
+selection-background = 7869c4
+selection-foreground = 40318d