Third-party libraries used by the Markdown editor

Marked 18.2.0 — https://github.com/markedjs/marked
MIT license. See marked-LICENSE.txt.

DOMPurify 3.4.17 — https://github.com/cure53/DOMPurify
Distributed under the Apache License 2.0. See DOMPurify-LICENSE.txt.

KaTeX 0.19.1 — https://github.com/KaTeX/KaTeX
MIT license. See katex/LICENSE. Includes the distributed KaTeX fonts.

Browser distributions were obtained from the corresponding versioned npm packages.
References to unbundled source maps were removed from Marked and DOMPurify.
These licenses apply to the respective libraries independently of EasyTrig's license.