add ghostty config and theme

configs/ghostty_g/themes/FishTank

@@ -0,0 +1,21 @@
+palette = 0=#03073c
+palette = 1=#c6004a
+palette = 2=#acf157
+palette = 3=#fecd5e
+palette = 4=#525fb8
+palette = 5=#986f82
+palette = 6=#968763
+palette = 7=#ecf0fc
+palette = 8=#6c5b30
+palette = 9=#da4b8a
+palette = 10=#dbffa9
+palette = 11=#fee6a9
+palette = 12=#b2befa
+palette = 13=#fda5cd
+palette = 14=#a5bd86
+palette = 15=#f6ffec
+background = 232537
+foreground = ecf0fe
+cursor-color = fecd5e
+selection-background = fcf7e9
+selection-foreground = 232537