Move related components to static properties

[satya164]

@Trancever implemented grouping for related components in component docs. Now we need to use it in Paper.

• Add related components as static properties instead of separate exports for Card, Dialog, Toolbar, ListSection, DrawerSection
• Add displayName to those components, e.g.: `static displayName = "Card.Actions" so that react docgen can read the name
• Add a comment like // @component ./CardActions.js above the static properties for the script
• Read these properties in the script to get the list of files to build

We should do it in 2.0 since it'll be a breaking change.

[gawrysiak]

Good news, nicely done @Trancever 👍

As for ListSection, it should be ListSection, ListSection.Item, ListSection.Accordion, right?

[satya164]

As for ListSection, it should be ListSection, ListSection.Item, ListSection.Accordion, right

Yeah. I think so

[satya164]

Fixed in cf0531b