Reorganize configuration root

While I might still bikeshed how the rest of the configuration is
sourced, at least the import points should be stable.

curacao/options.nix

@@ -0,0 +1,10 @@
+{ ... }:
+{
+  frogeye = {
+    desktop.xorg = true;
+    dev = {
+      docker = true;
+    };
+    extra = true;
+  };
+}