docs: Make https://argoproj.github.io/argo/

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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've signed the CLA.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

https://argoproj.github.io/argo/

Tasks

• Fixes Insufficient description in the doc regarding RBAC configuration #2581 (RBAC set-up) - TODO
• Fixes Provide more information about namespaced workflow install. #2687 (namespace set-up) - TODO
• Closes Epic: Improve the Docs #2549 (EPIC)
• See Links to examples on the documentation are broken #3203 (broken link) we should remove the old website
• See Docs link to 404 #3186 (broken link) delete this old site
• See Link broken on doc page - Workflow Executors #2567 (broken link) delete this old site - docs: remove argo workflows docs argo-site#28

Fix Elsewhere

See #934 (aggregate) pattern we should document in user guide
See #3295 (workflow of workflows) @sarabala1979 to fix
See #3202 (broken link) @simster7 to fix
See #2665 (DB schema docs) should we fix?
See #716 (base URL) confuses users, should fix

Under Consideration

See #2922 (CLI docs) can we do this automagically? investigate

Rejected

See #3057 (metrics)
See #2683 (CLI on windows)
See #2358 (OSS docs) - won't fix
See #1629 won't fix

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blue?

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ask @alexmt for new GA thing

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this should be sequenced in an logical order that builds knowledge