doc: Update & reorganize new argocd instance creation doc

[svghadi]

What type of PR is this? /kind documentation

What does this PR do / why we need it: Update & reorganize new argocd instance creation section in docs

Which issue(s) this PR fixes:

Fixes GITOPS-3527

[openshift-ci[bot]]

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[anandrkskd]

LGTM!

[iam-veeramalla]

/lgtm /approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: iam-veeramalla

The full list of commands accepted by this bot can be found here.

The pull request process is described here

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• ~~OWNERS~~ [iam-veeramalla]

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