docs(weathertop): improve operator setup and troubleshooting guide

[mjfxjas]

Summary

Improves Weathertop tool documentation with a practical setup and operations guide.

Changes

• Added a quick-start operator checklist.
• Added common setup pitfalls.
• Added operational success signals for validation.

Why

Issue #6961 requested improved documentation to make the tool easier for teams to understand and operate.

Closes #6961

[mjfxjas]

Thanks again for the review and approval.

If there is anything else you want adjusted before merge, wording, structure, or troubleshooting detail, I can update quickly.

[rlhagerm]

@scmacdon what is the benefit in adding this?

[mjfxjas]

Good question. The point is to reduce setup-to-first-success time for operators who hit common failures.

This addition gives a quick triage path for the issues we see most often (credentials/config/runtime mismatch), so users can isolate root cause fast instead of stepping through the full guide.

If this still feels too broad for this PR, I can trim it to only the highest-frequency troubleshooting case and move the rest to a follow-up docs change.

[mjfxjas]

Thanks for the pushback here. I made a focused update to clarify the direct operator benefit in the doc itself and kept scope narrow:\n\n- added a concise "Why this section exists" note to explain the intent\n- explicitly tied the checklist to reducing setup-to-first-success time\n- kept the content centered on common first-run failure points\n\nIf you want this reduced further, I can trim it to only the top 1-2 failure cases.

[mjfxjas]

@rlhagerm @scmacdon quick follow-up: I pushed a focused update to address the benefit question directly in the doc and kept scope narrow.\n\nWould you mind taking another look when you have a moment? If you want this trimmed further, I can reduce it to only the top 1-2 failure cases.

[rlhagerm]

This update is for an outdated (internal) tool, I'm going to close both the outdated issue and this PR.