update databroker settings reference page

[kenjenkins]

Change the page title and add a couple introductory sentences to help clarify that these settings are specifically about the databroker storage backend. Put the storage type setting first as it is the most important. Remove the settings that are currently unused. Update databroker settings redirects.

Related issues:

• https://github.com/pomerium/documentation/issues/1585
• https://github.com/pomerium/pomerium/issues/5277

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[kenjenkins]

I assume you'll close out the other related issues?

Yes I'll close https://github.com/pomerium/documentation/issues/1585 after merging. I've opened a separate PR for the code changes related to https://github.com/pomerium/pomerium/issues/5277:

• https://github.com/pomerium/pomerium/pull/5285