add ghostty config and theme

configs/ghostty_g/themes/Highway

@@ -0,0 +1,21 @@
+palette = 0=#000000
+palette = 1=#d00e18
+palette = 2=#138034
+palette = 3=#ffcb3e
+palette = 4=#006bb3
+palette = 5=#6b2775
+palette = 6=#384564
+palette = 7=#ededed
+palette = 8=#5d504a
+palette = 9=#f07e18
+palette = 10=#b1d130
+palette = 11=#fff120
+palette = 12=#4fc2fd
+palette = 13=#de0071
+palette = 14=#5d504a
+palette = 15=#ffffff
+background = 222225
+foreground = ededed
+cursor-color = e0d9b9
+selection-background = 384564
+selection-foreground = ededed