Allow Ctrl-V uploads from details and upload view

app/views/packages/details.slim

@@ -70,3 +70,13 @@
       / Right column contains metadata about the package.
       / #metadata is the anchor for this sticky container.
       = render(partial: 'details_rightbox', locals: {pkg: @package})
+
+javascript:
+  // Handle Ctrl-V to paste an image directly
+  document.onpaste = upload_paste_handler;
+
+  // Where to send POST requests for uploads
+  var ajax_upload_url = '#{{upload_receive_path(format: :json)}}';
+
+  // Where to go to after a successful image upload
+  var after_upload_url = '#{{package_path(@package)}}';