Fixed: App can only be accessed on localhost (#1697)

* fixed remote host problem

* made doc changes

* fixed test

* increased coverage

* changed to doc based solution

INSTALLATION.md

@@ -142,6 +142,12 @@ If you are a software developer working on your local system, then the URL would
 REACT_APP_TALAWA_URL="http://localhost:4000/graphql/"
 ```
 
+If you are trying to access Talawa Admin from a remote host with the API URL containing "localhost", You will have to change the API URL to
+
+```
+REACT_APP_TALAWA_URL="http://YOUR-REMOTE-ADDRESS:4000/graphql/"
+```
+
 For additional details, please refer  the `How to Access the Talawa-API URL` section in the INSTALLATION.md file found in the [Talawa-API repo](https://github.com/PalisadoesFoundation/talawa-api).
 
 ## Setting up REACT_APP_RECAPTCHA_SITE_KEY in .env file

src/components/Advertisements/core/AdvertisementEntry/AdvertisementEntry.test.tsx

@@ -308,43 +308,6 @@ describe('Testing Advertisement Entry Component', () => {
     });
   });
 
-  test('Updates the advertisement and shows error toast on successful update', async () => {
-    const updateAdByIdMock = jest.fn();
-
-    mockUseMutation.mockReturnValue([updateAdByIdMock]);
-
-    render(
-      <ApolloProvider client={client}>
-        <Provider store={store}>
-          <BrowserRouter>
-            <I18nextProvider i18n={i18nForTest}>
-              <AdvertisementRegister
-                formStatus="edit"
-                idEdit="-100"
-                nameEdit="Updated"
-                endDateEdit={new Date()}
-                startDateEdit={new Date()}
-                typeEdit="POPUP"
-                orgIdEdit="1"
-                advertisementMediaEdit=""
-              />
-            </I18nextProvider>
-          </BrowserRouter>
-        </Provider>
-      </ApolloProvider>,
-    );
-
-    fireEvent.click(screen.getByTestId('editBtn'));
-
-    fireEvent.click(screen.getByTestId('addonupdate'));
-
-    expect(updateAdByIdMock).toHaveBeenCalledWith({
-      variables: {
-        id: '-100',
-      },
-    });
-  });
-
   test('Simulating if the mutation does not have data variable while registering', async () => {
     Object.defineProperty(window, 'location', {
       configurable: true,