docs: Update Argo CD installation and API server access instructions

[revitalbarletz]

Clarified installation instructions for Argo CD and updated section title for API server access.

Fixes issue #24540

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[revitalbarletz]

@todaywasawesome I changed the text as well either, can you take another look please?

[revitalbarletz]

@crenshaw-dev & @todaywasawesome please review again. Thank you!

[nitishfy]

Technically, it is the api-server tha makes more sense to be here. I would recommend adding a link to the architecture docs here. Just saying Argo CD means all the components can't be exposed outside the cluster whereas in reality, it's only one component of Argo CD i.e. api-server which is not exposed with an external IP.

[revitalbarletz]

I think it should remain abstract and we should refer to Argo CD rather than Argo CD API - its a getting started guide and the component were not described yet here. It seems more of a high level document to me. @todaywasawesome / @crenshaw-dev what do you think?