feat(whitby): Deploy todo.tvl.fyi page with //web/todolist

Note that this is not yet updated automatically, so the page will be
stale until somebody rebuilds whitby.

Change-Id: I91f4b03c9309aed289df055fac292a214dca7668
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1297
Reviewed-by: Alyssa Ross <hi@alyssa.is>
Tested-by: BuildkiteCI

ops/nixos/www/todo.tvl.fyi.nix

@@ -0,0 +1,24 @@
+{ config, ... }:
+
+{
+  imports = [
+    ./base.nix
+  ];
+
+  config = {
+    services.nginx.virtualHosts."todo.tvl.fyi" = {
+      serverName = "todo.tvl.fyi";
+      root = config.depot.web.todolist;
+      enableACME = true;
+      forceSSL = true;
+
+      extraConfig = ''
+        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
+
+        location ~* \.(webp|woff2)$ {
+          add_header Cache-Control "public, max-age=31536000";
+        }
+      '';
+    };
+  };
+}