Update storefront icons

[beckichoi]

standardize icons to 32x32 and add title/description

[josephco]

@beckichoi We should remember to go through all icons later and remove any fills/strokes so they can be applied with CSS.

@misscs The updated icons are mostly using stroked paths instead of expanded outlines, so we will have to get used to applying stroke color in the CSS, rather than the fill.

[misscs]

@beckichoi Definitely need to go through and remove references to strokes.

@josephco That's a rather breaking change. We're going to need to update the version to 3 and update the readme to indicate the differences between the two. Additional cleanup PRs against nightshade and nightshade-core will need to happen as well before we can update the version in Nightshade

[misscs]

Great work on this commit @beckichoi! Going to be so nice to have standardized icons in a clean system.

[josephco]

@misscs Yeah, we will have to take care of that. When expanding the stroked paths to use fills, many of the icons became disfigured and lost their proportions. It seems the artwork maintains greater integrity this way (just using paths with stroke), but I will be testing in different browsers today to verify.

[misscs]

1. Reissue this PR against a new branch v3.0.0-dev
2. Update Nightshade package.json to point v3 branch
3. Update CSS in Nightshade-core/nighthade to leverage these new icons