Docs: updates duplicate/missing references

[ZPain8464]

This PR:

• Adds fragments to all identity-provider-settings paths
• Removes the client-certificate-authority entry
• Updates polling-max-delay description to use maximum instead of minimum

Note: One discrepancy is the identity-provider-polling-min-max-delay ID in reference.json, which isn't consistent with the anchor link: The anchor link is #identity-provider-minmax-delay, so the path uses this fragment instead of the key/id found in the reference file.

Resolves https://github.com/pomerium/internal/issues/1701

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[kenjenkins]

I think it would be better to remove this entry in a separate PR, if this PR will be backported to the v0.25 docs site. The corresponding change in Core (pomerium/pomerium#4918) won't be released until v0.26 at the earliest.

[ZPain8464]

@kenjenkins thanks for letting me know. I don't see a purpose in backporting these changes unless we want the idp fragments to be available in v25 for some reason?

[kenjenkins]

It's nice for the reference table entries to link directly to the corresponding setting documentation, but I agree it's not a major issue, so if you want to skip backporting this PR I think that would be fine as well.