Review all user documentation

• Installation of Apex: Standalone/docker-compose/Microk8s/K8S
  • Move installation documentation to same place as other components?
• Apex Configuration: Review and rewrite
• Apex Policy Guide and Policy Example: Rewrite
  • My First Policy example: Rewritten
  • PCVS example: delete
  • Decisionmaker: Update
  • vCPE: rewritten
  • AADM: Delete?
  • Adaptive: Delete?
  • ACM: ?
  • GRPC: Review
  • BBS: ?
  • Periodic: Review
  • Servlet: ?
• Check sample Policy definitions
• Check sample maven projects
• Provide demo/tutorial videos
• Help for houw to set up and work in IDEs like Intellij/Eclipse