Ko-fi fee changelog

Initial verification from Ko-fi's official pricing page (ko-fi.com/pricing; no effective-date is stated on the page) and its "Does Ko-fi take a fee?" help-centre article. Confidence medium: the free-account rates (0% on tips, 5% on shop sales, memberships and commissions) are corroborated by both sources, but Ko-fi Gold's 0% rate and its $12/month price are stated only on the primary page — the secondary article's fee table covers the free plan and its "Standard" toggle, not Gold.