fix(example-getting-started): remove api-docs

[shimks]

The tests that run when npm run release is run fail because api-docs is built when being bootstrapped in example-getting-started and aren't deleted afterwards. Because of this, the presence of api-docs are checked for when cloning from github and fails because api-docs aren't there. Besides, creating api-docs in example-getting-started seem moot.

This PR would remove api-docs building scripts from example-getting-started.

Checklist

• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• Related API Documentation was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in packages/example-* were updated

[raymondfeng]

@shimks I fixed the issue with https://github.com/strongloop/loopback-next/pull/913/files#diff-d01db79a7f64cff0d9cfd0a4d99e55d7R33 too. It makes sure api-docs is ignored for the test.

[shimks]

Closing as #913 fixes this issue