refactoring (#178)

* unify components import

* refactor config and app context

* refactor icons

* refactor date, error, mxid and storage

* refactor synapse utils

src/synapse/dataProvider.test.ts

@@ -1,7 +1,6 @@
 import fetchMock from "jest-fetch-mock";
 
 import dataProvider from "./dataProvider";
-import storage from "../storage";
 
 fetchMock.enableMocks();
 
@@ -10,8 +9,8 @@ beforeEach(() => {
 });
 
 describe("dataProvider", () => {
-  storage.setItem("base_url", "http://localhost");
-  storage.setItem("access_token", "access_token");
+  localStorage.setItem("base_url", "http://localhost");
+  localStorage.setItem("access_token", "access_token");
 
   it("fetches all users", async () => {
     fetchMock.mockResponseOnce(