add ghostty config and theme

configs/ghostty_g/themes/Ubuntu

@@ -0,0 +1,21 @@
+palette = 0=#2e3436
+palette = 1=#cc0000
+palette = 2=#4e9a06
+palette = 3=#c4a000
+palette = 4=#3465a4
+palette = 5=#75507b
+palette = 6=#06989a
+palette = 7=#d3d7cf
+palette = 8=#555753
+palette = 9=#ef2929
+palette = 10=#8ae234
+palette = 11=#fce94f
+palette = 12=#729fcf
+palette = 13=#ad7fa8
+palette = 14=#34e2e2
+palette = 15=#eeeeec
+background = 300a24
+foreground = eeeeec
+cursor-color = bbbbbb
+selection-background = b5d5ff
+selection-foreground = 000000