Add "Getting Started" docs to the docusaurus based docs site

[dharmit]

What mistake did you find / what is missing in the documentation?

N/A

What is the relevance of it?

This is a child issue of spawned from #4664 (comment)

Acceptance Criteria

"Getting Started" section gives users an overview about odo:

• Quickstart (Add quickstart guide to odo website #5143)
• Basics (Add Getting Started > Basics documentation #4914)
• Cluster Setup (Add Cluster Setup documentation #4973)
  • Development Cluster (this doc clarifies that odo docs help setup development clusters only.)
  • Kubernetes
  • OpenShift
• Installation (Add odo installation docs #4923)
• Import applications (talk about how existing git repo can be deployed to k8s using odo)
• Configuration (talk about odo preference file) (Add documentation for global configuration #4921)

/kind documentation
/kind task

[dharmit]

Opened separate issue for Quickstart. Rest of the things are done by @valaparthvi

/close

[openshift-ci]

@dharmit: Closing this issue.

In response to this:

Opened separate issue for Quickstart. Rest of the things are done by @valaparthvi

/close

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