Delete core-concepts.md (#1345)

docs/guide/core-concepts.md

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-# Core Concepts
-
-We will be learning the core concepts of Vuex in these chapters. They are:
-
-- [State](state.md)
-- [Getters](getters.md)
-- [Mutations](mutations.md)
-- [Actions](actions.md)
-- [Modules](modules.md)
-
-A deep understanding of all these concepts is essential for using vuex.
-
-Let's get started.