split data in separate files

docs/production-chains/bread.md

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+# Chain: Bread
+
+**Entity Type:** ProductionChain
+
+## Steps (Summary)
+
+| Step | Building | Input | Output | Cycle Time |
+|------|----------|-------|--------|------------|
+| 1 | Wheat Farm | None | Grain | 60s |
+| 2 | Grain Mill | Grain | Flour | 30s |
+| 3 | [Bakery](../buildings/bakery.md) | Flour + Charcoal | Bread | 60s |
+
+## Recommended Ratios
+
+2 Wheat : 1 Mill : 2 Bakeries
+
+## Bottlenecks
+
+- Charcoal availability
+- Bakery upkeep