Tracking issue: Narrative chart improvements

[marcelgerber]

These are some leftover parts after the cycle work in #4128.

Would be nice:

• (admin) Make it easy to hide all controls [4h]
  • ... by providing a button in the admin (Basic tab?) that patches the chart config accordingly.
• (admin) Provide a "Copy" button to the {.narrative-chart} component ArchieML code
• (admin) Provide a "Copy" button to the parent-chart link, i.e. the "Explore the data" link as seen in the narrative chart

Optional:

• (open question) enforce parent chart to be published
• ... or, alternatively, hide the "Explore the data" button if it's unpublished

Gdocs:

• Turn all existing gdoc-based narrative views (not a lot) into new narrative views
  • see: https://docs.google.com/spreadsheets/d/16KfGCqbKxqBtnIIt_QwZwyEKTHKufwgBXw7m9OUOiSo/edit?usp=sharing
• Update DI gdocs template to include narrative chart link
• Create example DIs that display an (interactive) narrative view instead of the static image

Optional cleanup:

• Remove existing title/subtitle-overriding code from the chart component, if it's no longer needed in prod