[Refactoring][Breaking Changes]

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

src/store/reducers/posts/postSelector.ts

@@ -0,0 +1,9 @@
+const getPost = (state: any, userId: string, postId: string) => {
+    return (state.post.userPosts && state.post.userPosts[userId] && state.post.userPosts[userId][postId])
+            ? state.post.userPosts[userId][postId]
+            : null
+}
+
+export const postSelector = {
+    getPost
+}