Replace bleach with nh3 #984
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Bleach is deprecated, so migrated to nh3 and pulled tinycss2 validator over from Bleach for sanitizing HTML / CSS to prevent XSS attacks.
The
css_sanitizer.pyimplementation is from the excellent, but deprecated bleach library: https://github.com/mozilla/bleach/blob/f8fb8482687df63d158d6eccfa2a8153ab467367/bleach/css_sanitizer.py