Create a new dashboards page that makes use of embeddable dashboards by reference

[chantal-kelm]

Description

The work on the new engine will generate events with a different schema. This will require to design a user-friendly interface to view the history of an alert, including all associated elements and their interactions, to facilitate better understanding and analysis.

We want to start with what we currently have implemented, but we need to introduce some changes to ensure the UI coherence.

• Design a standard container for dashboard, so the viewport is adjusted the same on all dashboards
• Design a responsive way to adjust the compoments of the dashboard in the same way on all dashboards
• Contemplate the inclusion of a left menu, included in the dashboard section, so we don't need to abuse the global menu
• Create a new dashboards page that makes use of embeddable dashboards by reference so they can be used in the reporting plugin
• Have the dashboards pre-loaded when the application is initialised.
• Give the user the option to undo changes.