Remove original times tutorial and old rst version of the new version.

Author: JoeZiminski

doc/how_to/handle_times.rst

@@ -8,7 +8,6 @@ Guides on how to solve specific, short problems in SpikeInterface. Learn how to.
 
     viewers
     handle_drift
-    handle_times
     analyse_neuropixels
     load_matlab_data
     combine_recordings