add ghostty config and theme

configs/ghostty_g/themes/Github

@@ -0,0 +1,21 @@
+palette = 0=#3e3e3e
+palette = 1=#970b16
+palette = 2=#07962a
+palette = 3=#f8eec7
+palette = 4=#003e8a
+palette = 5=#e94691
+palette = 6=#89d1ec
+palette = 7=#ffffff
+palette = 8=#666666
+palette = 9=#de0000
+palette = 10=#87d5a2
+palette = 11=#f1d007
+palette = 12=#2e6cba
+palette = 13=#ffa29f
+palette = 14=#1cfafe
+palette = 15=#ffffff
+background = f4f4f4
+foreground = 3e3e3e
+cursor-color = 3f3f3f
+selection-background = a9c1e2
+selection-foreground = 535353