Consolidate and restructure downsampling section #2239
Description
WORK IN PROGRESS
- Add new downsampling subsection
- Move conceptual info to new topic(s)
- Edit new conceptual page
- Generalize or remove repeated info
- Add tabs (or something) to show 3 different ways
- Match patterns and practices for titles, concepts, etc.
- Check xrefs and anchors
- Add redirects