Updated links in sig-apps and sig-auth READMEs

[Aryan-Bagale]

In sig-apps
directories were removed where OWNER file was, so I remove it from sig-apps README

Updated helm proposal URL
previous - https://github.com/cncf/toc/blob/main/proposals/incubation/helm.adoc
new - https://github.com/cncf/toc/blob/5103bce2ec283a8b641659a10362f10c65a97a08/projects/helm/helm-incubation-proposal.adoc

In sig-auth
directories authentication, authorization, Podsecuritypolicy was removed where OWNER file was so I removed it from sig-auth README

[k8s-ci-robot]

Hi @Aryan-Bagale. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[cblecker]

/ok-to-test

You actually need to remove these from sigs.yaml as these parts of the README are generated

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Aryan-Bagale
Once this PR has been reviewed and has the lgtm label, please assign palnabarun for approval. For more information see the Code Review Process.

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