Hide "docker" installation and all docker terminology

[kilrau]

Some users (most on Windows/Mac?) don't know what docker is and don't really care that it's needed.

[raladev]

Not sure that we need hide it fully, because it is THIRD PARTY app that will be installed on user's machine SILENTLY and will be added to AUTORUN.

At least we should mention it once during installation flow.

[peartobear]

FYI the current UX trend is to show what's happening and not hide it. Ex: https://zkga.me/