Cards

[allisonhorst]

First pass at adding layout/cards.md, introducing card class (mainly through examples)

Includes:

• Card content (showing that card content can be anything - images, charts, text, an input + table, etc.)
• Title and subtitle
• Content outside of cards

What is missing that we want to include?

TODO: resize on card content?

[trebor]

nothing but the smallest of nits! looks great!

[cinxmo]

Suggested change

	${
	Plot.plot({
	marks: [
	Plot.cell(weather, {x: d => d.date.getUTCDate(), y: d => d.date.getUTCMonth(),fill: "temp_max"})
	]
	})
	}
	${
	Plot.plot({
	marks: [
	Plot.cell(weather, {x: d => d.date.getUTCDate(), y: d => d.date.getUTCMonth(),fill: "temp_max"})
	]
	})
	}

[cinxmo]

there are a few more places with the div/ template literal indents, but otherwise looks good!

[Fil]

a few small changes