add ghostty config and theme

configs/ghostty_g/themes/Flat

@@ -0,0 +1,21 @@
+palette = 0=#222d3f
+palette = 1=#a82320
+palette = 2=#32a548
+palette = 3=#e58d11
+palette = 4=#3167ac
+palette = 5=#781aa0
+palette = 6=#2c9370
+palette = 7=#b0b6ba
+palette = 8=#212c3c
+palette = 9=#d4312e
+palette = 10=#2d9440
+palette = 11=#e5be0c
+palette = 12=#3c7dd2
+palette = 13=#8230a7
+palette = 14=#35b387
+palette = 15=#e7eced
+background = 002240
+foreground = 2cc55d
+cursor-color = e5be0c
+selection-background = 792b9c
+selection-foreground = ffffff