(amazon) Config-Reference.md: source kind and cards
(property, retirement accounts) Config-Reference.md: properties; account pre_tax and employer_monthly
(docs) Config-Reference.md: drop the unused tax field; credit-only fields
(budget layout) Config-Reference.md: budgets instead of scenarios, new page links
(v2 savings, cost types, child names) Config-Reference.md: contributions, savings, investments, kinds
(retire ages) Config-Reference.md: retirement_age
(generated subtitle) Config-Reference.md: empty subtitle is generated
(window end) Config-Reference.md: document plan.last_month
(wiki docs) Config-Reference.md: documentation page