Notify users in the front-end when the status page issues maintenance or incident

[pcrespov]

Our platform is connected to a status page that can be managed from here. This page shall be the source of truth for any maintenance scheduled or incident occuring in the platform. Any of those events should be treated according to its severity:

• Small : when the system is degraded but still functional, the user should be notified in the FE (popup/top nav-bar) or via email (if subscribed) about a degraded experience.
• Medium: when the system is dangerously getting overloaded, the user should be notified in the FE and platform load could be limited (e.g. stopping anonymous users )
• Critical: stop all users login, force-logout, and deploying maintenance page

Now that we have a context, this issue focus on how the FE could connect to the status page API to notify the users. Embedding your status in web apps, sites, portals, or forms will increase visibility of your system status and provide an easy way for users to access your page. This is an example provided in the status page doc

Review proposed approaches documented in

• https://status.osparc.io/api
• https://www.npmjs.com/package/@statuspage/status-widget
• https://manage.statuspage.io/pages/ncd5ygv24qhv/status-embed#default-widget-content

This is a sub issue from ITISFoundation/osparc-issues#675