Update from to-markdown to turndown

We got a security alert for a regular expression DoS attack on our used
library `to-markdown`.

After checking `to-markdown` to be maintained or not, it turned out they
renamed the library to `turndown`. So upgrading to `turndown` should fix
this vulnerbility.

References:
https://www.npmjs.com/package/to-markdown
https://github.com/domchristie/turndown/wiki/Migrating-from-to-markdown-to-Turndown
Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

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