DCE phase 1 - Remove AS references from documentation

We will discontinue Automotive Suite from sales (actually already in September 2021). The documentation should be changed in subsequent upcoming releases to reflect this change.

In an optimum case, the documentation will not follow our packaging and licensing structure but logical software architecture for easier discovery by a developer. E.g. platform support (like Mobile Android OS in Qt AD, or Embedded Android in Qt DC or Android Automotive OS in Qt DCE) is described where targets are described and there is some tagging mechanism to show if a feature is or is not part of a specific license.

But totally up to Documentation team to decide the structure of the Documentation. Note also that there is a planned change for new structure for ADP, ADE, DCP and DCE (this one now) for later, in January 2022.

This AS discontinuation and raise of DCE is caused by QTPMO-1394