Create slides that present Tails to the general public

It would be great to have slides that people can use and re-use to present Tails to the general public.

Those slides should be translatable.
They should be compiled from source code, for example using pandoc.
They should take into account other slides that we have created in the past: https://tails.boum.org/promote/slides/

Original created by @BitingBird on 6863 (Redmine)

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