chore: move module/constants.nix to lib/default.nix

lib/colours/owickstrom.nix

@@ -0,0 +1,37 @@
+rec {
+  black = {
+    bright = "#282c34";
+    dark = "#282c34";
+  };
+  red = {
+    bright = "#e06c75";
+    dark = "#e06c75";
+  };
+  green = {
+    bright = "#98c379";
+    dark = "#98c379";
+  };
+  yellow = {
+    bright = "#e5c07b";
+    dark = "#e5c07b";
+  };
+  blue = {
+    bright = "#61afef";
+    dark = "#61afef";
+  };
+  magenta = {
+    bright = "#c678dd";
+    dark = "#c678dd";
+  };
+  cyan = {
+    bright = "#56b6c2";
+    dark = "#56b6c2";
+  };
+  white = {
+    bright = "#dcdfe4";
+    dark = "#dcdfe4";
+  };
+  background = black.dark;
+  foreground = white.bright;
+  cursor = "#a3b3cc";
+}