remove niv residue

```fish
for d in {.,**/*}
    if [ ! -d $d ]; continue; end

    set from ./nix/sources.nix
    set to   ./npins

    set from (realpath -s $from --relative-to $d)
    set to   (realpath -s $to   --relative-to $d)

    echo "($d, $from, $to)"

    for f in $d/*
        if [ ! -f $f ]; continue; end
        sed -i "s=$from=$to=" $f
    end
end
```

Justfile

@@ -5,7 +5,7 @@ os host action:
         #!/usr/bin/env bash
         set -euo pipefail
 
-        nixpkgs=$(nix-instantiate --eval -E "let sources = import ./nix/sources.nix; in sources.nixpkgs.outPath" | jq -r .)
+        nixpkgs=$(nix-instantiate --eval -E "let sources = import ./npins; in sources.nixpkgs.outPath" | jq -r .)
         sudo nixos-rebuild {{ action }} \
                 -I nixpkgs=${nixpkgs} \
                 -I nixos-config=./nix/configurations/{{ host }}.nix \
@@ -17,7 +17,7 @@ install host:
         #!/usr/bin/env bash
         set -euo pipefail
 
-        nixpkgs=$(nix-instantiate --eval -E "let sources = import ./nix/sources.nix; in sources.nixpkgs.outPath" | jq -r .)
+        nixpkgs=$(nix-instantiate --eval -E "let sources = import ./npins; in sources.nixpkgs.outPath" | jq -r .)
         sudo nixos-install \
                 -I nixpkgs=${nixpkgs} \
                 -I nixos-config=./nix/configurations/{{ host }}.nix \

default.nix

@@ -1,4 +1,4 @@
-{sources ? import ./nix/sources.nix}: {
+{sources ? import ./npins}: {
   lib = import (sources.nixpkgs + "/lib");
 
   nixosConfigurations = builtins.mapAttrs (_: import (sources.nixpkgs + "/nixos/lib/eval-config.nix")) {

nix/configurations/tungsten.nix

@@ -1,6 +1,6 @@
 # Entry point to cherry pick modules
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 
   hostname = "tungsten";
   username = "leana";

nix/configurations/vanadium.nix

@@ -1,6 +1,6 @@
 # Entry point to cherry pick modules
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 
   hostname = "vanadium";
   username = "leana";

nix/configurations/vanadium/overlay.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../../sources.nix;
+  sources = import ../../../npins;
   lib = import (sources.nixpkgs + "/lib");
 
   infuse-lib = import sources.infuse {

nix/devShells/flora.nix

@@ -2,7 +2,7 @@
 # This is the non flake shell that just gets the basics of flora so I can have hls support outside of docker
 #
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   {pkgs ? import sources.pin-florashell {}}:
     pkgs.mkShell (let

nix/devShells/necro-man.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   {pkgs ? import sources.pin-necro-man-nixpkgs {}}: let
     shell = {

nix/devShells/vim-tw.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   {pkgs ? import sources.pin-vim-tw {}}:
     pkgs.mkShell {

nix/overlays/agenix.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   final: _: {
     inherit (final.callPackage sources.agenix {}) agenix;

nix/overlays/disko.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   final: _: {
     disko =

nix/overlays/fcitx5-table-extra-taiwanese.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   final: prev: {
     fcitx5-table-extra = prev.fcitx5-table-extra.overrideAttrs (oldAttrs: {

nix/overlays/nil.nix

@@ -1,6 +1,6 @@
 # Run the one with my cool feature here for now
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
   inherit (sources) nil;
   inherit (nil.repository) owner repo;
 in

nix/overlays/nix-tree.nix

@@ -1,7 +1,7 @@
 # The one in nixpkgs doesn't work
 # Getting nix-tree: user error (Failed parsing nix path-info output.)
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   final: _: {
     nix-tree = (import sources.nix-tree).packages.${final.system}.default;

nix/overlays/nur.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   _: prev: {
     nur = import sources.nur {

nix/overlays/pin-emacs28.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   _: _: {
     unsafe-emacs28 = (import sources.pin-emacs28 {}).emacs;

nix/overlays/pin-isabelle-2023.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   _: _: {
     # Isabelle version 2023

nix/overlays/pin-wireshark.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   _: _: {
     # Wireshark bug

nix/overlays/wallpapers.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   _: _: {
     wallpapers = import sources.wallpapers {};

nix/overlays/wired-notify.nix

@@ -1,4 +1,4 @@
 let
-  sources = import ../sources.nix;
+  sources = import ../../npins;
 in
   (import sources.wired-notify).overlays.default

nix/packages/default.nix

@@ -1,4 +1,4 @@
-{sources ? import ../sources.nix}: let
+{sources ? import ../../npins}: let
   scopeOverlay = overlay: final: prev: {export = prev.export or {} // overlay final prev;};
 in
   (

nix/sources.nix

@@ -1,2 +0,0 @@
-# Compatibility shim that redirects to npins
-import ../npins

shell.nix

@@ -1,5 +1,5 @@
 {
-  sources ? import ./nix/sources.nix,
+  sources ? import ./npins,
   pkgs ?
     import sources.nixpkgs {
       overlays = map import [