[spp] Update docs structure

[ogawa.yasufumi at lab.ntt.co.jp]

From: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>

Hi,

This series of patches is to update structure of documentation as I
announced in [1].

Here is the contents of updated documentation. Previous `Soft Patch
Panel` section is divided into `Overview` and `Design` because `Design`
has become to have much descriptions for increasing SPP processes. `Use
case` section is also moved from `Setup Guide` to doc root for the same
reason. 

- Overview
- Design
  1. Soft Patch Panel
  2. SPP Controller
  3. SPP Primary
  4. SPP Secondary
- Setup Guide
  1. Getting Started
  2. How to Use
  3. Performance Optimization
- Use Cases
  1. spp_nfv
- SPP Commands
  1. Primary Commands
  2. Secondary Commands
  3. Common Commands
  4. Experimental Commands
- Tools
  1. SPP Container
- SPP VF
  1. Overview
  2. Design
  3. Getting Started
  4. Use Cases
  5. Explanation
- API Reference
  1. spp-ctl REST API

Descriptions for spp-ctl are moved to each of sections, and API
reference is only remained as `API Reference` section because it could
contain APIs of other processes might be released in a future. However,
`SPP VF` section is remained because it is updated to add descriptions
of new feature `spp_pcap` soon. It is moved to each of sections after
this update.

[1] https://mails.dpdk.org/archives/spp/2018-December/001036.html

Thanks,
Yasufumi

Yasufumi Ogawa (11):
  docs: change structure of overview section
  docs: move overview of spp-ctl to SPP overview
  docs: update image of SPP overview
  docs: update overview section
  docs: add overview image for design section
  docs: add image of design of spp-ctl
  docs: add SPP controller in design section
  docs: add spp_primary in design section
  docs: move design section to doc root
  docs: move usecases to doc root
  docs: remove spp-ctl section

 docs/guides/api_ref/index.rst                      |   11 +
 docs/guides/api_ref/spp-ctl.rst                    | 1723 ++++++++++
 docs/guides/design/index.rst                       |   15 +
 docs/guides/design/spp.rst                         |   37 +
 docs/guides/design/spp_controller.rst              |   87 +
 docs/guides/design/spp_primary.rst                 |   26 +
 docs/guides/design/spp_secondary.rst               |   18 +
 .../overview/design/spp_overview_design_all.svg    |  861 +++++
 .../design/spp_overview_design_spp-ctl.svg         |  678 ++++
 docs/guides/images/overview/spp_overview.svg       | 3465 ++++++++++++++++++--
 docs/guides/index.rst                              |    7 +-
 docs/guides/overview.rst                           |   47 +-
 docs/guides/setup/getting_started.rst              |   21 +-
 docs/guides/setup/howto_use.rst                    |   19 +-
 docs/guides/setup/index.rst                        |    1 -
 docs/guides/setup/use_cases.rst                    |  670 ----
 docs/guides/spp-ctl/api-reference.rst              | 1714 ----------
 docs/guides/spp-ctl/index.rst                      |   14 -
 docs/guides/spp-ctl/overview.rst                   |  119 -
 docs/guides/use_cases/index.rst                    |   11 +
 docs/guides/use_cases/spp_nfv.rst                  |  671 ++++
 21 files changed, 7394 insertions(+), 2821 deletions(-)
 create mode 100644 docs/guides/api_ref/index.rst
 create mode 100644 docs/guides/api_ref/spp-ctl.rst
 create mode 100644 docs/guides/design/index.rst
 create mode 100644 docs/guides/design/spp.rst
 create mode 100644 docs/guides/design/spp_controller.rst
 create mode 100644 docs/guides/design/spp_primary.rst
 create mode 100644 docs/guides/design/spp_secondary.rst
 create mode 100644 docs/guides/images/overview/design/spp_overview_design_all.svg
 create mode 100644 docs/guides/images/overview/design/spp_overview_design_spp-ctl.svg
 delete mode 100644 docs/guides/setup/use_cases.rst
 delete mode 100644 docs/guides/spp-ctl/api-reference.rst
 delete mode 100644 docs/guides/spp-ctl/index.rst
 delete mode 100644 docs/guides/spp-ctl/overview.rst
 create mode 100644 docs/guides/use_cases/index.rst
 create mode 100644 docs/guides/use_cases/spp_nfv.rst

-- 
2.7.4