Fix RDE css/js resources to handle a prefix in the path. And fix the kiketable plugin css not being packaged for prod
use link_to helper to create popover links
use link_tag helpers for plugin assets
Add new config entries for frontend_prefix and public_prefix
Fix config prefix gsub
Modifications to make asset precompilation work with a URI prefix
Add readme for running under a prefix
New words for prefix readme
Use the public_prefix and frontend_prefix in the routes scope call
Update README_PREFIX.md
Merge pull request #625 from hudmol/path-with-prefix

[Delivers #62104836] Allow ArchivesSpace to run under a prefix e.g. http://example.com/aspace