Add support for building the site via nix.

nix/package.nix

@@ -0,0 +1,31 @@
+{
+  lib,
+  pkgs,
+  natter,
+  organic_ast_explorer,
+  homepage_private,
+}:
+let
+
+in
+pkgs.stdenv.mkDerivation rec {
+  pname = "homepage";
+  version = "0.0.0";
+
+  src = lib.cleanSource ../.;
+
+  configurePhase = "";
+
+  buildPhase = ''
+    mkdir -p static/organic/ast_explorer
+    cp ${organic_ast_explorer}/* static/organic/ast_explorer/
+    cp -r ${homepage_private}/static/* static/
+
+    ${natter}/bin/natter build --config natter.toml
+  '';
+
+  installPhase = ''
+    mkdir -p $out
+    mv output/* $out/
+  '';
+}