New documentation and updated website and examples.

[cpojer]

This gets Jest ready for 0.9.0.

What's new?

• Slightly refreshed look, based on the Relay website.
• New summary of what Jest is on the website.
• New Getting Started guide, with babel support and key feature explanation.
• Added a troubleshooting section.
• Updated all examples in the documentation.
• Added all new APIs to the API docs, updated everything to use jest.fn() instead of jest.genMockFn().
• Removed the webpack alias and coffeescript guides. Neither of them are really supported or useful at this point. We can bring back a guide later on proper webpack integration if someone in the community takes this on. The webpack-alias feature is handled by the moduleNameMapper API.
• Added a link to the Failed to get metadata error in Jest.

See http://cpojer.github.io/jest/ for a preview.

In a follow-up I'll add a section on async testing for Promises and some more info about automocking.

[craigdallimore]

I noticed that if I already have

"scriptPreprocessor": "<rootDir>/node_modules/babel-jest"

in my package.json, the babel-jest part will not be shown here.

[cpojer]

yeah, you should remove this line after updating to 0.9.0 (and babel-jest 9.0.0) because it will no longer be necessary.

[cpojer]

@facebook-github-bot import

[facebook-github-bot]

Thanks for importing. If you are an FB employee go to Phabricator to review.

[github-actions]

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