We shouldn't refresh notifications on every page + fix localStorage

[lakesare]

1. Notifications should be renewed without setting { status: 'request' } on subsequent api calls.

2. There shouldn't be a residual '1 notification is unread' when we:

• have one notification
• mark it as read
• switch to another page, and see one notification as unread for a few seconds.

This happens because we don't update value in our localStorage whenever amount of unread notifications changes.

[lakesare]

Let's put <Notifications/> state into redux instead of keeping it in the component.