Move assets to subpackages

[alancleary]

This is a catch-all for issues related to moving the contents of the assets/ directory into their own subpackages:

High priority:

• ERROR TypeError: Cannot read properties of undefined (reading 'coordinates') #424 difficult
• javascript error in console leading to perpetual wait for search results in alignment pipeline #420 difficult

Medium priority:

Low priority:

• Move GCV assets to pseudo package #776 easy