Dashboard, menu and dashboard voting page

[elboletaire]

Some considerations:

• I've recreated the dashboard layout from scratch.
• I've created a new components/Dashboard folder. The folder used for most dashboard components right now is Organization, which does not align with our real intentions here.
• Use the DashboardContents component to draw the main dashboard contents, or DashboardBox to draw boxes. See ProcessView for more details on this.
• I haven't looked the dashboard menu.. I've just reused what we had there, but it needs a refactor too. Using individual setState methods for each submenu doesn't look like the way to go. Remade the dashboard menu as well.
• I've removed some components that were useless, but there are still some others that should be removed, like the useDarkMode one. The DarkModeSwitcher has been removed, and the already existing SwitchColorMode is being used instead.
• The dashboard layout allows you to set both a title and a back button via useOutletContext (see ProcessView for more details on this).
• I've removed the default buttons behavior, which was coloring them in green for most of the cases. A proper review/recheck of the buttons should be done when we have an actual style guide to follow.

[github-actions[bot]]

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[github-actions[bot]]

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[elboletaire]

Mental note: the right margin must be properly added to the layout, rather than to the view like it is right now (that's why is only displayed for the dashboard process view).

Also, review all other admin pages are properly using DashboardContents component.

Edit: done, and remade the dashboard menu too