chore: update getting-started guide for 2.5.2 and apply other tweaks

[crenshaw-dev]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I have written unit and/or e2e tests for my change. PRs without these are unlike to be merged.
• Optional. I've added My organization is added to the README.
• I've signed the CLA and required builds are green.

The namespace changes feel strange to me... is there a reason why getting-started namespaces to argo by default? If not, I'd as soon drop -n argo from all the below commands and just add a link pointing to the namespaced install yaml.

[claassistantio]

All committers have signed the CLA.

[codecov]

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[crenshaw-dev]

@simster7 changes made and issue submitted for the odd behavior that led me to think workflows had to be in the same namespace as the controller.

[simster7]

Thank you @mac9416!