split data in separate files

docs/schemas/_index.md

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+# Schemas
+
+Entity type definitions that describe the structure of all game elements.
+
+## Available Schemas
+
+- [Building](./building.md) - Production, service, and infrastructure buildings
+- [Good](./good.md) - Tradeable and consumable items
+- [PopulationTier](./population-tier.md) - Citizen classes and their needs
+- [ProductionChain](./production-chain.md) - Manufacturing sequences
+- [Specialist](./specialist.md) - Characters that modify building stats
+- [ShipHull](./ship-hull.md) - Ship base types
+- [ShipModule](./ship-module.md) - Ship equipment and upgrades