update mathjax to recommended cdnjs CDN provider

Waqar144 / CuteMarkEd-NG

Markdown Editor in Qt 5

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Closed chowette closed 3 years ago

chowette commented 3 years ago

correct the following navigator warning :

WARNING: cdn.mathjax.org has been retired. Check https://www.mathjax.org/cdn-shutting-down/ for migration tips.