fetches repos too frequently

[Simpath]

Every time tab is switched to home it starts syncing repos. Fix this. It's also not good for rate limit.

• Auto refresh on app launch

• Give an option to choose auto refresh interval while app is in background and post notification for available updates

• Make a manual refresh button Don't fetch an app even on manual button press if it was fetched less than five minutes ago only fetch newly added apps then which haven't been fetch even once until now