feat(web/tazblog_lisp): Implement retrieval of blog posts from DNS

This is mostly equivalent to the Haskell implementation, with the
primary difference that the Lisp DNS library does not support caching
yet.

web/tazblog_lisp/default.nix

@@ -0,0 +1,21 @@
+{ pkgs, ... }:
+
+pkgs.nix.buildLisp.library {
+  name = "tazblog";
+
+  deps =
+  # Local dependencies
+  (with pkgs.lisp; [ dns ])
+
+  # Third-party dependencies
+  ++ (with pkgs.third_party.lisp; [
+    cl-base64
+    cl-json
+    hunchentoot
+    iterate
+  ]);
+
+  srcs = [
+    ./store.lisp
+  ];
+}