Put a banner when detecting Tor exit node but with a non-Tor Browser on the website advising to use TB instead

In the same spirit of #23721 (moved)

changed milestone to %website redesign

added component::webpages/styleguide milestone::website redesign owner::hiro parent::23721 priority::medium reviewer::antonela severity::normal status::new type::enhancement ux-team labels

Trac:
Milestone: N/A to website redesign

see question in comment:6:ticket:23721

Trac:
Owner: N/A to hiro
Parent: N/A to #23721 (moved)
Component: Webpages/Website to Webpages/Styleguide
Reviewer: N/A to antonela

moved to tpo/web/styleguide-trac#23735 (closed)