Restructured Kubeflow Pipelines docs (#3737)

* Restructured Kubeflow Pipelines docs

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* Fixed broken links

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* Moved new redirects to the end of the file

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* Renamed How-to/User guides to User guides

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* Fixed redirects

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* Removed double slash typo

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* Fixed "Legacy v1" title

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* Added "Operator Guides" section

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* Added brackets to Legacy page

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* Moved Introduction and getting-started.md to the root

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* Reverted changes to other components

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* Removed catch-all redirects and moved new redirects to the bottom of the file

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* Renamed the how-to directory to user-guides

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* Regrouped user guides

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* Moved "Concepts" to Pipelines

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* Moved component-spec.md

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* Moved interfaces.md

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* Moved pipeline-root.md

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* Reverted changes outside of pipelines

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* Update content/en/docs/components/pipelines/reference/sdk.md

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* Removed warning

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* Fixed /docs/components/pipelines/installation/ broken links

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* Removed beta status flag from pipeline-root.md

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* Fixed broken links

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* Fixed broken links

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* Update content/en/_redirects

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* Update content/en/_redirects

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* Update content/en/docs/components/pipelines/concepts/component.md

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* Update content/en/docs/components/pipelines/legacy-v1/sdk/manipulate-resources.md

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* Update content/en/docs/components/pipelines/legacy-v1/sdk/python-function-components.ipynb

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* Update content/en/docs/components/pipelines/legacy-v1/sdk/python-function-components.md

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* Update content/en/docs/components/pipelines/legacy-v1/tutorials/api-pipelines.md

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* Update content/en/docs/components/pipelines/legacy-v1/tutorials/build-pipeline.md

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* Fixed redirects

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* Fixed redirects

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---------

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Co-authored-by: Mathew Wicks <5735406+thesuperzapper@users.noreply.github.com>

Author: hbelmiro

assets/icons/pipelines.svg

@@ -41,7 +41,7 @@ <h3 class="section-head text-center">Kubeflow Components</h3>
   <div class="container">
     <div class="card-deck">
       <div class="card border-primary-dark">
-        <a href="/docs/components/pipelines/v2/introduction/" target="_blank" rel="noopener" >
+        <a href="/docs/components/pipelines/overview/" target="_blank" rel="noopener" >
           <img
             src="/docs/images/logos/kubeflow.png"
             class="card-img-top"
@@ -53,7 +53,7 @@ <h3 class="section-head text-center">Kubeflow Components</h3>
         <div class="card-body bg-primary-dark">
           <h5 class="card-title text-white section-head">Pipelines</h5>
           <p class="card-text text-white">
-            <a target="_blank" rel="noopener" href="/docs/components/pipelines/v2/introduction/">Kubeflow Pipelines</a> (KFP) is a platform for building then deploying portable and scalable machine learning workflows using Kubernetes.
+            <a target="_blank" rel="noopener" href="/docs/components/pipelines/overview/">Kubeflow Pipelines</a> (KFP) is a platform for building then deploying portable and scalable machine learning workflows using Kubernetes.
           </p>
         </div>
       </div>

content/en/_index.html

@@ -54,5 +54,5 @@ weight = 40
 ## Next steps
 
 - See a [simple example](https://github.com/kubeflow/examples/tree/master/pipelines/simple-notebook-pipeline) of creating Kubeflow pipelines in a Jupyter notebook.
-- Build machine-learning pipelines with the [Kubeflow Pipelines SDK](/docs/components/pipelines/sdk/sdk-overview/).
+- Build machine-learning pipelines with the [Kubeflow Pipelines SDK](/docs/components/pipelines/legacy-v1/sdk/sdk-overview/).
 - Learn the advanced features available from a Kubeflow notebook, such as [submitting Kubernetes resources](/docs/components/notebooks/submit-kubernetes/) or [building Docker images](/docs/components/notebooks/custom-notebook/). 

content/en/_redirects

@@ -1,5 +1,5 @@
 +++
 title = "Concepts"
 description = "Concepts used in Kubeflow Pipelines"
-weight = 30
+weight = 4
 +++

content/en/docs/components/notebooks/jupyter-tensorflow-examples.md

@@ -57,11 +57,11 @@ deserialize the data for use in the downstream component.
 
 ## Next steps
 
-* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/introduction/).
-* Follow the [pipelines quickstart guide](/docs/components/pipelines/overview/quickstart/) 
+* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/overview/).
+* Follow the [pipelines quickstart guide](/docs/components/pipelines/getting-started/) 
   to deploy Kubeflow and run a sample pipeline directly from the Kubeflow 
   Pipelines UI.
 * Build your own 
-  [component and pipeline](/docs/components/pipelines/sdk/build-component/).
-* Build a [reusable component](/docs/components/pipelines/sdk/component-development/) for
+  [component and pipeline](/docs/components/pipelines/legacy-v1/sdk/component-development/).
+* Build a [reusable component](/docs/components/pipelines/legacy-v1/sdk/component-development/) for
   sharing in multiple pipelines.

content/en/docs/components/pipelines/v1/concepts/_index.md renamed to content/en/docs/components/pipelines/concepts/_index.md

@@ -12,7 +12,7 @@ groups. Experiments can contain arbitrary runs, including
 
 ## Next steps
 
-* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/introduction/).
-* Follow the [pipelines quickstart guide](/docs/components/pipelines/overview/quickstart/) 
+* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/overview/).
+* Follow the [pipelines quickstart guide](/docs/components/pipelines/getting-started/) 
   to deploy Kubeflow and run a sample pipeline directly from the Kubeflow 
   Pipelines UI.

content/en/docs/components/pipelines/v1/concepts/component.md renamed to content/en/docs/components/pipelines/concepts/component.md

@@ -24,7 +24,7 @@ parent contains a conditional clause.)
 
 ## Next steps
 
-* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/introduction/).
-* Follow the [pipelines quickstart guide](/docs/components/pipelines/overview/quickstart/) 
+* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/overview/).
+* Follow the [pipelines quickstart guide](/docs/components/pipelines/getting-started/) 
   to deploy Kubeflow and run a sample pipeline directly from the Kubeflow 
   Pipelines UI.

content/en/docs/components/pipelines/v1/concepts/experiment.md renamed to content/en/docs/components/pipelines/concepts/experiment.md

@@ -15,11 +15,11 @@ data to rich interactive visualizations.
 
 ## Next steps
 
-* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/introduction/).
-* Follow the [pipelines quickstart guide](/docs/components/pipelines/overview/quickstart/) 
+* Read an [overview of Kubeflow Pipelines](/docs/components/pipelines/overview/).
+* Follow the [pipelines quickstart guide](/docs/components/pipelines/getting-started/) 
   to deploy Kubeflow and run a sample pipeline directly from the Kubeflow 
   Pipelines UI.
 * Read more about the available 
-  [output viewers](/docs/components/pipelines/sdk/output-viewer/) 
+  [output viewers](/docs/components/pipelines/legacy-v1/sdk/output-viewer/) 
   and how to provide the metadata to make use of the visualizations
   that the output viewers provide.