Added KaTeX license and procedure to build it for Gitlab
What does this MR do?
Adds KaTeX license and the procedure for building KaTeX for gitlab.
Are there points in the code the reviewer needs to double check?
Nope.
Why was this MR needed?
Requested by @stanhu
Screenshots (if relevant)
Not relevant.
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together