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Pull Request Checklist
Description
tested by creating a demo site and adding
to the post.
Based on #3710, Fixes #3709
Review needed since I haven't used math mode in nikola before and, for example, not sure about "double " needed in input. Also, KaTeX seems to support some more environment and I'm not sure if the the setup one should only use the * version of those or the one without star or both?