We now do ECH too

In the continuation of the journey to make this the most modernized web page with the oldest looking design, we've added ECH. Now, does this ECH implementation do anything usefull? Not really, because our cover site is "ech.uni.cubicchaos.net" – very sneaky, I know. But now with ech, http3, dnssec, rpki, and https records, I can't think of any other modernizations to apply (IPv6 I consider standard/required and not a "moderization", but we've got that too). In other news, in the "make this website accessible from the most hidden networks" project, I'm probably going to add in DN42 support somewhat soon.