docs: (PRO-272) add fees summary

[amilz]

adds summary table explaining fee estimation
merges into #212

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Important

Adds FEES.md detailing Kora's fee estimation and updates README.md to reference it.

• Documentation:
  • Adds FEES.md to docs/operators/, detailing Kora's fee estimation process and components.
  • Updates README.md to include a reference to the new FEES.md guide, highlighting its importance for node operators.

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[linear]

PRO-272 add fees docs

[ellipsis-dev]

Important

Looks good to me! 👍

Reviewed everything up to 30c139a in 58 seconds. Click for details.

• Reviewed 58 lines of code in 2 files
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1. docs/operators/FEES.md:31

• Draft comment:
  Add a newline at the end of the file to conform to best practices.
• Reason this comment was not posted:
  Decided after close inspection that this draft comment was likely wrong and/or not actionable: usefulness confidence = 10% vs. threshold = 50% This is a new file being added, so it is about a change. However, the comment is about a very minor formatting issue. Our rules state not to make comments that are obvious or unimportant. Most editors automatically add trailing newlines, and this kind of formatting detail doesn't impact functionality. A missing trailing newline could cause issues with some tools or make diffs less clean. Some would argue this is a valid best practice to enforce. While true, this is still too minor of an issue to warrant a PR comment. Many tools handle this automatically, and it doesn't affect the document's content or functionality. Delete this comment as it violates our rule about not making obvious or unimportant comments. This kind of minor formatting issue doesn't warrant a PR comment.

2. docs/operators/README.md:61

• Draft comment:
  The link to the Fee Estimation Guide in README is clear and useful. Good improvement.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

Workflow ID: wflow_05OvAAF36PtZJDEu

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