[GHC] #15006: User guide uses cnd.mathjax.org, which has shut down

[GHC]

#15006: User guide uses cnd.mathjax.org, which has shut down
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        Reporter:  lyxia             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.3
       Component:  Documentation     |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ulysses4ever):

 Seems that Sphinx switched CDN [https://github.com/sphinx-
 doc/sphinx/issues/3599 since 1.5.5].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15006#comment:1>
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