IPv6 support

Hi, the main website already supports IPv6, well done!

Sadly, the CDN does not yet appear to support IPv6: *.tb-cdn.st

OVH (the origin of the IPv4) does support IPv6 in their products for free.

Please consider adding support, as most ISPs do not give you IPv4 anymore but instead use NAT64 or DS-Lite, so it could improve speed/latency.

It is also just the modern standard, so you don’t need to do it in the future :)