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

lib/colours/apprentice.nix

@@ -0,0 +1,37 @@
+{
+  black = {
+    bright = "#444444";
+    dark = "#1c1c1c";
+  };
+  red = {
+    bright = "#ff8700";
+    dark = "#af5f5f";
+  };
+  green = {
+    bright = "#87af87";
+    dark = "#5f875f";
+  };
+  yellow = {
+    bright = "#ffffaf";
+    dark = "#87875f";
+  };
+  blue = {
+    bright = "#8fafd7";
+    dark = "#5f87af";
+  };
+  magenta = {
+    bright = "#8787af";
+    dark = "#5f5f87";
+  };
+  cyan = {
+    bright = "#5fafaf";
+    dark = "#5f8787";
+  };
+  white = {
+    bright = "#999999";
+    dark = "#6c6c6c";
+  };
+  background = "#262626";
+  foreground = "#bcbcbc";
+  cursor = "#bcbcbc";
+}