add ghostty config and theme

configs/ghostty_g/themes/gruber-darker

@@ -0,0 +1,21 @@
+palette = 0=#181818
+palette = 1=#f43841
+palette = 2=#73d936
+palette = 3=#ffdd33
+palette = 4=#96a6c8
+palette = 5=#9e95c7
+palette = 6=#95a99f
+palette = 7=#e4e4e4
+palette = 8=#52494e
+palette = 9=#ff4f58
+palette = 10=#73d936
+palette = 11=#ffdd33
+palette = 12=#96a6c8
+palette = 13=#afafd7
+palette = 14=#95a99f
+palette = 15=#f5f5f5
+background = 181818
+foreground = e4e4e4
+cursor-color = ffdd33
+selection-background = ffffff
+selection-foreground = 52494e