Depends on the bandwidth. You can use services like CloudFlare for DDoS mitigation, and some hosts provide DDoS protection as well, but all of those services are expensive and WL is broke. Besides, the website itself is just a static collection of links, at the moment. Given that, the value of defending the website against temporary takedown probably doesn't justify the cost of doing so.

Some ISPs/hosts have DDoS protection, where they drop the traffic on their end (where the bandwidth is high) versus trying to drop it on your end (where the bandwidth is relatively low). Trying to break a DDoS on your end almost always results in your network dying when you're dealing with a dedicated, high bandwidth DoS.