add nsp & run in test suite

fixes #1637

update some dependencies

remove medium-editor-insert-plugin

fixes #2127

fix case in property

fixes #2475

remove purest, add blueimp-file-upload

blueimp-file-upload was an implicit dependency from the medium-editor-insert-plugin
but we explicitly require it in our webpack config

update co-body

update deps (fixes #2436) and remove fsevents (unused)

update koa-static-cache

Co-authored-by: Originate <originated@users.noreply.github.com>