docs: modified README files (#4782)

www/README.md

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+# Documentation Resources
+
+This directory holds the code and content of both the [documentation](https://docs.medusajs.com/) and [API reference](https://docs.medusajs.com/api/admin).
+
+## docs Directory
+
+The `docs` directory holds the code and content of the documentation website. The website is built with [Docusaurus v2](https://docusaurus.io/).
+
+### api-reference Directory
+
+The `api-reference` directory holds the code and OpenApi Specs of the API Reference. The API Reference is built with [Next.js](https://nextjs.org/).