notebooks

As a follow-up to #11540, we would like to add metadata to as many examples as possible. This will not only make the examples more usable as they are right now, but it will also open up new possibilities to search for and crosslink examples.

For the purpose of this issue, 'standalone examples' are all .py files in these folders in this repository:

• examples/plotting/file
• `examples/mode

Is your feature request related to a problem? Please describe.
It's cumbersome to create the same step twice.

Describe the solution you'd like
Add a button to duplicate a step in the pipeline editor.

Ideas
We could combine this with some other ideas in a context menu (right click).

Credit to Serhii Ostapchuk for contributing this on Slack.

Is your feature request related to a problem? Please describe.
The elyra-pipeline CLI displays a documentation link when help is invoked, e.g.

$ elyra-pipeline --help
Usage: elyra-pipeline [OPTIONS] COMMAND [ARGS]...

  Run Elyra pipelines in your local environment or submit them to an external
  service, such as Kubeflow Pipelines or Apache Airflow.

  Find more information at:

The fix will be to call addCallbacks() either for all rows or whenever the table of schedules is modified in some way.

🚀 Feature

SVG images currently cannot be properly scaled in the generated HTML version.

Motivation

Embedded SVG images are automatically scaled to 100% of the notebook width. Using Markdown syntax or HTML adds the width and height arguments in the img tag in the generated HTML, which however seem to not work. For example, the following two expressions lead to SVG images with 10