Script specified to generate API docs does not exist

[sirockin]

• I have searched for similar issues in this repository, but couldn't find one.
• I have read the README and have a basic understanding how angular works.

I'm submitting a...

• Regression (a behavior that used to work and stopped working in a new release)
• Bug report  
• Feature request

Current behavior

Can not generate docs as specified on website

The instructions are to run npm run docs or npm run docs:serve (presumably from the repo root).

When I do this I get

npm ERR! missing script: serve:docs
...

Can confirm that no matching scripts are defined in package.json

Expected behavior

Am able to generate docs. Better, still, docs could be published somewhere.