Docs: Add missing panel config & other viz docs content

This issue is to keep track of content additions that need to be made in the panel config (and other non-Visualizations) documentation by the DataViz squad. If you're working on an item, please update the list item to add your name/GH handle next to it. - [ ] Configure data links - Add a good use case and example in the introduction of the page - [ ] Configure data links - Add an example in the intro of the **Data link variables** section - [ ] Configure data links - Map UI options to variables - @imatwawana