Delete https://nullstorm.com

[gelsbern]

SearX is a really great concept and I thought contributing to the community would be awesome, but I've spent way too long trying to get this working on a public server. My private instances on my lan have worked perfectly for over 2 months now, but the public instance constantly getting blocked by google has made it super frustrating for me. I even bought a XXX.XX proxy plan with 100 proxies and still it gets blocked. I'll just stick to my local docker install for when I am at home.

Instance added by the issue #641