SSDM-13579: Made the last link in the path look different, and if the user is in the root directory the home button will be disabled.

SSDM-13579: Fixed infinite refresh issue and the fact that even nested files were shown in the list.

SSDM-13579: Added a check in the pre-flight requests (OPTIONS) branch, which is required for a DELETE request. This is to make it do a real request check instead of merely accepting everything.

SSDM-13579: Made the server accept pre-flight requests (OPTIONS), which is required for a DELETE request.