Add live Codepen links for BokehJS API

[paddymul]

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

Bokeh at master

Description of expected behavior and the observed behavior

There should be links to js live coding sites with the examples from the documentation for bokehjs. From this page https://bokeh.pydata.org/en/latest/docs/user_guide/bokehjs.html

Complete, minimal, self-contained example code that reproduces the issue

I have created a pull request that fixes this.

[github-actions]

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