Addon-docs: Switch Meta block to receive all module exports

[tmeasday]

What I did

Update Meta doc block syntax:

import * as FooStories from './foo.stories';

<Meta of={FooStories} />

<Story of={FooStories.FirstStory} />

Use the above to implement ComponentStories for Docs2 👍 (not yet done in external docs)

How to test

Run react-ts, external-docs

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[shilman]

This is awesome @tmeasday -- really great stuff 💯