More precise platform pages

Snapchat is now shown as an assisted destination in development, like the rest of the integrations. The Instagram guide explains the two ways to connect an account and which one allows the Paid partnership label. The home and features pages now say plainly that Inktaro never crops or trims your video, and that statistics are shown platform by platform, never added up. New blog article: why the same vertical video can publish on one platform and fail on another.