docs: Add more readable argo CLI installation guide. Fixes #11750 #11751
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Fixes #11750
Motivation
Currently, when user want to install Argo CLI, it is quite hard to find.
This is not in Argo CLI walk through, but in Quick Start.
(You can find out that only some kind comments in Argo CLI walk through page are the only guide for the new users)
And still in Quick Start, it is just redirection to the release note page.
I want to put this installation guides into documentation, in Argo CLI walk through page.
In this way, the user who just pass quick guide and search with keyword 'Argo CLI' can find how to install this in walk through page.
Modifications
I append the installation step guide from release note to the Argo CLI walk through page.
And add link to Argo CLI walk through page in the Quick Start page.
Verification
N/A