cmd/recorder: polish UI
cmd/recorder: polish UI

Make the admin GUI better:
 - Redirect after POST to prevent resending form data on page reload.
 - Display request method
 - Make recorded URLs clickable
 - Add -output flag and display it in the GUI
 - More descriptions in the GUI.

vdobler/ht,vdobler/ht,vdobler/ht,vdobler/ht