Have more promotion material
Originally created by @BitingBird on #14523 (Redmine)
spriver will care for stickers (https://tails.boum.org/contribute/how/promote/material/stickers/)
BitingBird will see about posters, postcards, bussiness cards with fingerprint (https://tails.boum.org/contribute/how/promote/material/business_cards/)
Xin is interested to help.