Improve guidance and structure on Sign Up, Free Trial, Deploy pages

[amotl]

About

Now, after getting the repository reasonably into shape, the next steps are about sanding it properly.

@proddata already offered two valuable suggestions where to improve right away.

• I can imagine all the (Sign Up, Free Trial, Deploy) sections on two pages. We don’t need to explain every step of how to create a user account.
• Regarding the payment options, it really just is a single payment method currently. It was a bit different in the past.