Docs: inconsistent urls and broken links

[kostis-codefresh]

(Reported by Bryan Taylor in the CNCF slack channel)

The documentation pages have mixed rendering results where sometimes the extension .html works and sometimes it doesn't

https://argoproj.github.io/argo-rollouts/features/traffic-management/istio/ -> renders a broken page
https://argoproj.github.io/argo-rollouts/features/traffic-management/istio.html -> works ok

But on the other hand

https://argoproj.github.io/argo-rollouts/getting-started/istio/ -> works ok
https://argoproj.github.io/argo-rollouts/getting-started/istio.html -> renders a broken page.

The issue here (apart from the inconsistency) is that the broken links are indexed by Google confusing users.

We should either fix all links to have a consistent rendering or make the wrong ones return 404 instead of broken renderings

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[jessesuen]

Fixed in #1321 and #1322