switch over hopper fully (+ minor refactoring)

nix/systemProfiles/core/docs.nix

@@ -0,0 +1,15 @@
+{
+  self,
+  super,
+  root,
+}: {pkgs, ...}: {
+  documentation = {
+    dev.enable = true;
+    # man.generateCaches = true; # this does slow down builds by quite a lot
+  };
+  environment.systemPackages = with pkgs; [
+    linux-manual
+    man-pages
+    man-pages-posix
+  ];
+}