stub out more of the guide

Author: runspired

guides/reactive-data/index.md

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+# Reactive Data
+
+In addition to request and cache management, WarpDrive provides a reactive access
+layer for data in the cache.
+
+Data in the cache is conceptualized as belonging to one of three forms
+
+- **Documents** - the response to a request
+- **Resources** - a unique cacheable entity within the response to a request
+- **Fields** - the data for an individual property on a resource
+
+Each form of data can be accessed and managed reactively through one of two modes
+
+- *(upcoming, default in v6)* [PolarisMode](./polaris/overview.md)
+- *(current, default in v5)* [LegacyMode](./legacy/overview.md)

guides/reactive-data/legacy/overview.md

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+# LegacyMode
+
+- ⮐ [ReactiveData](../index.md)
+
+---
+

guides/reactive-data/polaris/overview.md

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+# PolarisMode
+
+- ⮐ [ReactiveData](../index.md)
+
+---
+