add ghostty config and theme

configs/ghostty_g/themes/mellow

@@ -0,0 +1,21 @@
+palette = 0=#27272a
+palette = 1=#f5a191
+palette = 2=#90b99f
+palette = 3=#e6b99d
+palette = 4=#aca1cf
+palette = 5=#e29eca
+palette = 6=#ea83a5
+palette = 7=#c1c0d4
+palette = 8=#353539
+palette = 9=#ffae9f
+palette = 10=#9dc6ac
+palette = 11=#f0c5a9
+palette = 12=#b9aeda
+palette = 13=#ecaad6
+palette = 14=#f591b2
+palette = 15=#cac9dd
+background = 161617
+foreground = c9c7cd
+cursor-color = cac9dd
+selection-background = 2a2a2d
+selection-foreground = c1c0d4