Update file mkdocs.yml

        - NFV API: ./architecture/nfvapi.md

      - Issue management: ./architecture/issuemgt.md

      - Central logging: ./architecture/centrallog.md

  - Contributing to OSL:

    - Developing: ./contributing/developing.md

    - Documenting: ./contributing/documenting.md

  - Contribute:

    - Developing: ./contribute/developing.md

    - Documenting: ./contribute/documenting.md

  - Terminology: terminology.md