add ghostty config and theme

configs/ghostty_g/themes/SpaceGray

@@ -0,0 +1,21 @@
+palette = 0=#000000
+palette = 1=#b04b57
+palette = 2=#87b379
+palette = 3=#e5c179
+palette = 4=#7d8fa4
+palette = 5=#a47996
+palette = 6=#85a7a5
+palette = 7=#b3b8c3
+palette = 8=#000000
+palette = 9=#b04b57
+palette = 10=#87b379
+palette = 11=#e5c179
+palette = 12=#7d8fa4
+palette = 13=#a47996
+palette = 14=#85a7a5
+palette = 15=#ffffff
+background = 20242d
+foreground = b3b8c3
+cursor-color = b3b8c3
+selection-background = 16181e
+selection-foreground = b3b8c3