Move sandbox into website

Nest the sandbox work under ./website.

default.nix

@@ -10,7 +10,6 @@ in {
   nixos       = readTree ./nixos;
   utils       = readTree ./utils;
   emacs       = readTree ./emacs;
-  sandbox     = readTree ./sandbox;
   website     = readTree ./website;
   lisp        = readTree ./lisp;
   gopkgs      = readTree ./gopkgs;

nixos/socrates/configuration.nix

@@ -172,7 +172,7 @@ in {
       "sandbox.wpcarro.dev" = {
         addSSL = true;
         enableACME = true;
-        root = briefcase.sandbox;
+        root = briefcase.website.sandbox;
       };
     };
   };

website/sandbox/default.nix

@@ -1,15 +1,13 @@
 { pkgs, briefcase, ... }:
 
-let
-  covid-uk = briefcase.sandbox.covid-uk;
-in pkgs.stdenv.mkDerivation {
+pkgs.stdenv.mkDerivation {
   name = "covid-uk";
   buildInputs = [];
   src = ./.;
   buildPhase = ''
     mkdir -p $out
     cp $src/index.html $out
-    cp -r ${briefcase.sandbox.covid-uk} $out/covid-uk
+    cp -r ${briefcase.website.sandbox.covid-uk} $out/covid-uk
   '';
   dontInstall = true;
 }