adjust lightness settings in theme gen scripts

app-config/ghostty/heathland-monobiome-dark.config

@@ -0,0 +1,41 @@
+# base settings
+background = #28252b
+foreground = #e6e3eb
+
+selection-background = #343137
+selection-foreground = #d6d2da
+
+cursor-color = #d6d2da
+cursor-text = #343137
+
+# black
+palette = 0=#28252b
+palette = 8=#413e44
+
+# red
+palette = 1=#e15344
+palette = 9=#fa8979
+
+# green
+palette = 2=#64a46e
+palette = 10=#87c28f
+
+# yellow
+palette = 3=#9b9555
+palette = 11=#bab474
+
+# blue
+palette = 4=#5e8de4
+palette = 12=#8ab1f8
+
+# magenta (red)
+palette = 5=#c38141
+palette = 13=#dfa36d
+
+# cyan (blue)
+palette = 6=#5e8de4
+palette = 14=#8ab1f8
+
+# white
+palette = 7=#c6c2ca
+palette = 15=#e6e3eb