Make sure tails.boum.org is available over IPv6
Originally created by @usul on #12113 (Redmine)
The internet is moving from v4 to v6. making the website and some
mirrors available over v6 would probably help some people bypass ipv4
only censor tools.
For the record my mirror is ipv6 accessible.
- Related to #16767 (closed)
Blocked by #14588 (closed)
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