split data in separate files

docs/goods/garum.md

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+# Garum
+
+**Entity Type:** Good
+
+## Properties
+
+| Field | Value |
+|-------|-------|
+| Category | Need / Food |
+| Used For | Consumption (Plebeians Food need) |
+| Available From | Plebeians |
+
+## Production
+
+**Produced By:** [Garum Maker (Latium)](../buildings/garum-maker-latium.md)
+
+**Consumed By:** [Plebeians](../population-tiers/tier-ii.md)
+
+## Inputs Required
+
+- [Mackerel](./mackerel.md)
+- [Salt](./salt.md)