Update Environment Reference page

[erlendr]

Update the Environment Reference page: http://www.condep.io/docs/4-0/env-reference/

• Update any breaking changes in v5
• Describe all possible config properties
  • OperationsConfig
  • Tiers
  • PowerShellScriptFolders
  • PowerShell
  • DeploymentUser
  • ++

Reference:

• https://github.com/condep/condep-dsl/blob/master/src/ConDep.Dsl/Config/ConDepEnvConfig.cs
• https://github.com/condep/condep-execution/blob/master/src/ConDep.Execution.Tests/JsonParsingTests.cs