Add index.md files for both explanations and how to guides.

Author: colinmurphy

docs/explanation/index.md

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+---
+title: "Explanation"
+description: "High-level conceptual guides that provide background information and understanding of Headless WordPress development with the Headless WordPress Toolkit."
+---
+
+I see you found the root of the Explanatory guides! Explanatory guides are a place where we step away from code and talk high-level concepts and import background information. If you are looking to grow your understanding of Headless WordPress with the toolkit, you are in the right place.
+
+> [!note] Learn More
+> For more info on how we layout our documentation and the the role played by Explanatory Guides, please read about the [_Diátaxis_](https://diataxis.fr/explanation/) approach we use.
+
+## Contributing
+
+If you feel like something is missing or you want to add documentation, we encourage you to contribute! Please check out our [Contributing Guide](https://github.com/wpengine/hwptoolkit/blob/main/CONTRIBUTING.md) for more details.

docs/how-to/index.md

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+---
+title: "How-to Guides"
+description: "Step-by-step guides for implementing specific features and achieving practical goals with the Headless WordPress Toolkit."
+---
+
+I see you found the root of the How-to guides! How-to guides are a place where we walk you through implementing specific features of the Headless WordPress Toolkit. If you are looking to achieve a specific goal with the toolkit, you are in the right place.
+
+> [!note] Learn More
+> For more info on how we layout our documentation and the the role played by How-to guides, please read about the [_Diátaxis_](https://diataxis.fr/how-to-guides/) approach we use.
+
+## Contributing
+
+If you feel like something is missing or you want to add documentation, we encourage you to contribute! Please check out our [Contributing Guide](https://github.com/wpengine/hwptoolkit/blob/main/CONTRIBUTING.md) for more details.