Explain how Dangerzone also protects from metadata leakage

[deeplow]

Explain how Dangerzone can protect in publication security because it removes metadata from documents.

Notes / Evidence

A participant understood from reading the website that Dangerzone was more of a tool that could help in document intake security, but in reality it also protects journalists from accidentally posting documents with metadata.

[apyrgio]

Malware and metadata removal are two important features of Dangerzone that should be the very first thing that a user sees. It would make sense to briefly summarize them in the front page (see #19), and add a link to an FAQ section with a more detailed explanation.

(Similar approach to #17)