Move global styling to top-level css file

[tomduggan85]

It might be safer to keep these global styles:

mpcc-assistant/src/client/components/dashboard/dashboard.css

Lines 1 to 4 in 6c0d9f5

	* {
	margin: 0;
	padding: 0
	}

In a new, more top-level css file (maybe create an app.css, or site.css). Then, if the dashboard component ends up getting changed or removed or something, these styles won't be lost.