Add installation instructions to website

This adds the installation instructions to the website under the same
section, for visibility and ease of navigation. There's no new
information from what you can find on the repo docs for each component,
but the installation instructions are presented in a cohesive way,
following the same style and structure to provide a better experience
for the user.

This also fixes some minor formatting errors and updates links in the
"Getting started" tutorials.

content/en/docs/Concepts/_index.md

@@ -1,7 +1,7 @@
 ---
 title: "Concepts"
 linkTitle: "Concepts"
-weight: 2
+weight: 3
 description: >
   Conceptual and technical information about Tekton
 ---

content/en/docs/Getting Started/pipelines.md

@@ -1,29 +1,31 @@
+<!--
 ---
 title: "Getting Started with Pipelines"
 linkTitle: "Getting Started with Pipelines"
 weight: 2
 description: >
   Create and run your first Tekton pipeline
-
 ---
+-->
 
 This tutorial shows you how to:
 
-- Create two tasks.
-- Create a pipeline containing your tasks.
-- Use `PipelineRun` to instantiate and run the pipeline containing your tasks.
+1.  Create two tasks.
+1.  Create a pipeline containing your tasks.
+1.  Use `PipelineRun` to instantiate and run the pipeline containing your tasks.
 
 For this tutorial we are going to use [minikube][minikube] to run the commands
 locally.
 
 ## Prerequisites
 
-- Complete the [Getting started with tasks](/docs/getting-started/tasks/)
-  tutorial. *Do not clean up your resources*, skip the last section.
+1.  Complete the [Getting started with tasks](/docs/getting-started/tasks/)
+    tutorial. *Do not clean up your resources*, skip the last section.
 
-- [Install the Tekton CLI](/docs/cli/).
+1.  [Install the Tekton CLI](/docs/installation/tkn-cli/), which provides `tkn`
+    command.
 
-## Creating and running a second task
+## Create and run a second task
 
 You already have a *Hello World!* task. To create a second *Goodbye World!*
 task:
@@ -54,7 +56,7 @@ task:
 When a task is part of a pipeline you don't have to instantiate it, the pipeline
 is going to take care of that.
 
-## Creating and running a pipeline
+## Create and run a pipeline
 
 A **[pipeline](/docs/pipelines/pipelines/)** defines an ordered series of tasks
 arranged in a specific execution order as part of your CI/CD workflow.

content/en/docs/Getting Started/tasks.md

@@ -1,10 +1,12 @@
+<!--
 ---
 title: "Getting started with Tasks"
 likTitle: "Tasks"
 weight: 1
 description: >
   Set up and run your first Tekton task
 ---
+-->
 
 This tutorial shows you how to 
 

content/en/docs/Installation/_index.md

@@ -0,0 +1,22 @@
+<!--
+---
+title: "Installation"
+linkTitle: "Installation"
+weight: 2
+description: >
+  Install Tekton components on you cluster
+---
+-->
+
+This section provides instructions to install different Tekton components on
+your cluster. To proceed with the installation you must already have a cluster
+with the correct permissions and [kubectl] installed and configured.
+
+If you are going to test Tekton locally on your computer, we recommend trying
+either [Minikube] or [Kind]. The [Getting Started][getting-started] guides show
+how to run several simple examples using Minikube.
+
+[minikube]: https://minikube.sigs.k8s.io/docs/start/
+[kind]: https://kind.sigs.k8s.io/docs/user/quick-start/
+[kubectl]: https://kubernetes.io/docs/tasks/tools/#kubectl
+[getting-started]: /docs/getting-started/