split data in separate files

docs/production-chains/porridge.md

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+# Chain: Porridge
+
+**Entity Type:** ProductionChain
+
+## Steps
+
+| Step | Building | Input | Output | Cycle Time |
+|------|----------|-------|--------|------------|
+| 1 | [Oat Farm](../buildings/oat-farm.md) | None | [Oats](../goods/oats.md) | 60s |
+| 2 | [Porridge Stand](../buildings/porridge-stand.md) | Oats | [Porridge](../goods/porridge.md) | 60s |
+
+## Recommended Ratios
+
+Oat Farm 1 : Porridge Stand 1 (both 60s)
+
+## Bottlenecks
+
+- Field layout
+- Fertility
+- Hauling distance