v0.4.0

• ready to be used with --rc-web-gui
• taking into account that user might have set --rc-no-auth (suggested by @silisium)
• folder creation UX improvements
  • setting focus in the folder name input field when Create folder clicked
  • executing folder creation on pressing Enter (in addition to clicking on Create)
  • clearing folder name input field after the folder has been created
• some styling improvements