modules: services: blog: use 302 redirection

That way the browser doesn't cache it, in case I do end up using that
domain after all.

modules/services/blog/default.nix

@@ -36,7 +36,7 @@ in
         useACMEHost = domain;
         default = true;
 
-        locations."/".return = "301 https://belanyi.fr$request_uri";
+        locations."/".return = "302 https://belanyi.fr$request_uri";
       };
     };