Editable file

	modified:   Gemfile
	modified:   Gemfile.lock
	modified:   app/controllers/basic_files_controller.rb
	modified:   app/models/concerns/generic_file.rb
	modified:   app/views/basic_files/show.html.erb
	modified:   config/routes.rb
	modified:   db/schema.rb
	modified:   spec/controllers/basic_file_controller_spec.rb
	app/views/basic_files/_content_fields.html.erb
	app/views/basic_files/edit.html.erb
Merge branch 'brev_ingest' of https://github.com/Det-Kongelige-Bibliotek/valhal into brev_ingest