add ghostty config and theme

configs/ghostty_g/themes/OneHalfLight

@@ -0,0 +1,21 @@
+palette = 0=#383a42
+palette = 1=#e45649
+palette = 2=#50a14f
+palette = 3=#c18401
+palette = 4=#0184bc
+palette = 5=#a626a4
+palette = 6=#0997b3
+palette = 7=#fafafa
+palette = 8=#4f525e
+palette = 9=#e06c75
+palette = 10=#98c379
+palette = 11=#e5c07b
+palette = 12=#61afef
+palette = 13=#c678dd
+palette = 14=#56b6c2
+palette = 15=#ffffff
+background = fafafa
+foreground = 383a42
+cursor-color = bfceff
+selection-background = bfceff
+selection-foreground = 383a42