[Canvas] Create a 'Getting started' workpad that demonstrates Canvas features

[ryankeairns]

Use Canvas to explain Canvas!

At the Global All Hands, @rayafratkina did just that and it seems like something we could formalize as a shareable example - whether delivered as a template, as part of a sample data set, or via some other source (a repo of workpads, tutorial, blog post, etc.).

The gist is that each page in the workpad introduces and demonstrates how a feature of Canvas works. Example content would be:

• a Markdown element with a query and instructions to switch a data source and paste the query
• arrows point to and describing various sidebar content and features (e.g. zoom, fullscreen, add element, view assets, order and align elements, etc.)
• provide link text that point to docs, sample repos/workpads, keyboard shortcuts, etc.
• how to use a specific element
• how to change the data source
• how to style an element
• how to create a custom element
• etc, etc

[elasticmachine]

Pinging @elastic/kibana-canvas

[shaunmcgough]

Here's a link to the workpad that @rayafratkina and @cqliu1 did for the GAH that is referenced above.

[Heenawter]

Closing for now - this is a great idea, but it just doesn't fit into our current roadmap for Canvas. If our priorities change, we can reopen.