change register and helper location in lateral menu

  - Overview:

      - Introduction: index.md

      - Release Notes: releasenotes.md

      - Architecture: architecture.md

      - Architecture:

          - Introduction: ./architecture.md

          - Register:

              - Introduction: ./register/register.md

              - Swagger: ./register/swagger.md

          - Helper:

              - Introduction: ./helper/helper.md

              - Swagger: ./helper/swagger.md

  - Getting Started:

      - How to Run: ./gettingstarted/howtorun.md

  - Features:

      - Api Status: ./api-status/api-status.md

      - Event Filter: ./event-filter/event-filter.md

      - Dynamic Configuration: ./configuration/configuration.md

  - Helper:

      - Introduction: ./helper/helper.md

      - Swagger: ./helper/swagger.md

  - Register:

      - Introduction: ./register/register.md

      - Swagger: ./register/swagger.md

  - SDK:

      - Introduction: ./sdk/sdk.md

  - Example Clients: