refactor(web/blog): Use timestamps for dates instead of strings

This lets me easily create an ordered list of entries if the homepage
is designed to list both blog posts and other content.

web/blog/default.nix

@@ -11,7 +11,7 @@ let
   post = struct "blog-post" {
     key = string; #
     title = string;
-    date = string; # *sigh*
+    date = int;
 
     # Path to the Markdown file containing the post content.
     content = path;
@@ -39,8 +39,7 @@ let
     ${lib.concatStringsSep "\n" (map (post:
       "cp ${fragments.renderPost post} $out/${post.key}.html"
     ) posts)}
-  ''; # '' (this line makes nix-mode happy :/)
-
+  '';
 in import ./nginx.nix (args // {
   inherit posts renderedBlog;
 })