add ghostty config and theme

configs/ghostty_g/themes/Slate

@@ -0,0 +1,21 @@
+palette = 0=#222222
+palette = 1=#e2a8bf
+palette = 2=#81d778
+palette = 3=#c4c9c0
+palette = 4=#264b49
+palette = 5=#a481d3
+palette = 6=#15ab9c
+palette = 7=#02c5e0
+palette = 8=#ffffff
+palette = 9=#ffcdd9
+palette = 10=#beffa8
+palette = 11=#d0ccca
+palette = 12=#7ab0d2
+palette = 13=#c5a7d9
+palette = 14=#8cdfe0
+palette = 15=#e0e0e0
+background = 222222
+foreground = 35b1d2
+cursor-color = 87d3c4
+selection-background = 0f3754
+selection-foreground = 2dffc0