Add sitemap to wpcarro.dev

- Create ./website directory
- Add a sitemap to wpcarro.dev
- Move covid-uk directory to sandbox directory

TODO: Next sandbox, blog, and learn in the website directory

sandbox/covid-uk/default.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+
+pkgs.stdenv.mkDerivation {
+  name = "covid-uk";
+  buildInputs = [];
+  src = ./.;
+  # TODO(wpcarro): Need to run `yarn install` somehow.
+  # TODO(wpcarro): Need to run `npx tailwindcss build styles.css -o output.css`.
+  buildPhase = ''
+    mkdir -p $out
+    mkdir -p $out/node_modules/chart.js/dist
+    cp $src/node_modules/chart.js/dist/Chart.bundle.min.js $out/node_modules/chart.js/dist
+    cp $src/index.html $src/output.css $out
+  '';
+  dontInstall = true;
+}