Docs: restructure Configure value mappings page (#80103)
* Consolidated four add mappings tasks into one
* Moved images from tasks to types of value mappings section
* Removed edit value mappings section
* Moved sentence about reordering mappings to intro section
* Docs: Add to and update Configure value mappings page (#80104)
* Added to do notes
* Updated intro text and screenshot
* More intro edits
* Updated Types of value mappings section
Replaced bullet list items with headings
Updated text and screenshots of section
* Updated Add a value mapping task
* Recast sentence to remove passive voice
* Replaced local image files with images on admin
(cherry picked from commit c696b5e1dd)
Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
330d3adae2