Web UI refactor

[remohammadi]

• Improving the list of machines: suggestions are noted in the attached screenshot.
• When clicked on a machine, a modal window should be shown with these details and actions on the selected machine:
  • Hardware address
  • Links to addresses which generate cloudconfig, ignition, and bootparams files for the selected machine.
  • The editable list of current flags for this machine, and a way to add more.