Delete the redux/reducers guide (#20938)

guide/english/redux/reducers/index.md

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-title: Reducers
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-### What are the reducers in Redux?
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-Reducers are the pure functions that take an action and an previous state and return new state. Given the same input, the reducer should always return the same output.<sup>1</sup> 
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-In a simple sense, reducers are gatekeepers of the redux central store.
-- Components subscribe to the central data store which gets passed via props
-- In order to make changes to the data store, components dispatch actions (along with optional payload)
-- These actions gets passed onto reducers which then update the redux data store
-### Sources 
-
-1. http://redux.js.org/docs/basics/Reducers.html