docs(readme): add note for usage on -hooks and -hooks-web (#3651)

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**Summary**

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Adds a two-way clarification in the readme of React InstantSearch hooks
and React InstantSearch hooks web to explain what each package is used
for.

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fixes https://github.com/algolia/react-instantsearch/discussions/3610

Author: Haroenv

packages/react-instantsearch-hooks-web/README.md

@@ -12,6 +12,8 @@ You should be using React InstantSearch Hooks Web if you want to:
 * Customize your components at will
 * Follow React principles
 
+Note: If you are working with React Native, or otherwise do not use the DOM, check out `react-instantsearch-hooks` instead.
+
 ## Installation
 
 React InstantSearch is available on the npm registry. It relies on [`algoliasearch`](https://github.com/algolia/algoliasearch-client-javascript) to communicate with Algolia APIs.

packages/react-instantsearch-hooks/README.md

@@ -10,6 +10,8 @@ InstantSearch’s goal is to help you implement awesome search experiences as sm
   </a>
 </p>
 
+> Note: `react-instantsearch-hooks` exports renderless components and hooks which can be used for both web and React Native. If you are using React in a web project, we recommend using the package `react-instantsearch-hooks-web` instead, as it includes complete components that render to the DOM.
+
 ## Installation
 
 React InstantSearch Hooks is available on the npm registry. It relies on [`algoliasearch`](https://github.com/algolia/algoliasearch-client-javascript) to communicate with Algolia APIs.