Feature/a11y testing

[malcolm-kee]

resolves #105

This PR introduces accessibility checking for all the examples, which is hugely inspired by Storybook Accessibility Addon.

All examples will be supported.

Possible future enhancements

• Show the a11y results in standalone view.

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Latest commit: 0cd77c30680844176724397027ee9aebeec495d5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

| Name | Type | | ------------------- | ----- | | @showroomjs/bundles | Minor | | @showroomjs/core | Minor | | react-showroom | Minor | | @showroomjs/ui | Minor | | client-only-example | Patch | | react-example | Patch | | subpath-example | Patch | | react-showroom-docs | Patch |

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