[Refactoring][Breaking Changes]

- Move `reducers` and `actions` folders to `store` folder.
 - Move pages container components to `containers` folder.

src/store/reducers/posts/index.ts

@@ -0,0 +1,7 @@
+import { postReducer } from './postReducer'
+import { postSelector } from './postSelector'
+
+export {
+    postReducer,
+    postSelector
+}