Add troubleshooting docs

[KevinMGranger]

Describe the behavior changes introduced in this PR

Addresses the remaining todo items listed in #549, as well as some feedback from

• "how to ready your data for pelorus" docs section
• move troubleshooting from demo to top-level doc section

Linked Issues?

resolves #549

Testing Instructions

Run a test as in #615 (with human-readable output) and verify that suggestions and links to the troubleshooting URL are present.

[openshift-ci]

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[openshift-ci]

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[openshift-merge-robot]

@KevinMGranger: PR needs rebase.

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[openshift-ci]

@KevinMGranger: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/4.12-e2e-openshift	2ade153	link	true	/test 4.12-e2e-openshift
ci/prow/4.13-e2e-openshift	2ade153	link	true	/test 4.13-e2e-openshift

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