put past events in folders based on the year of the event

content/events/2016/_index.md

++++
+title = "2016"
+description = "Historical listing of various HCC events for the year 2016."
+weight = "30"
++++
+
+Historical listing of HCC Events
+----------
+
+{{% children %}}

content/events/2016/desktop.ini

+[LocalizedFileNames]
+unl_numerical_analysis_class_august_5th_2016.md=@unl_numerical_analysis_class_august_5th_2016,0
+xsede_workshop_big_data_november_2016.md=@xsede_workshop_big_data_november_2016,0
+xsede_workshop_openacc_december_2016.md=@xsede_workshop_openacc_december_2016,0
+hcc_fall_kickstart_2016.md=@hcc_fall_kickstart_2016,0
+hcc_qiime_workshop_2016.md=@hcc_qiime_workshop_2016,0
+software_carpentry_workshop_uno_july_14_15_2016.md=@software_carpentry_workshop_uno_july_14_15_2016,0

content/events/2017/_index.md

++++
+title = "2017"
+description = "Historical listing of various HCC events for the year 2017."
+weight = "30"
++++
+
+Historical listing of HCC Events
+----------
+
+{{% children %}}

content/events/2017/desktop.ini

+[LocalizedFileNames]
+unl_r_for_biologists_class_march_8_2017.md=@unl_r_for_biologists_class_march_8_2017,0
+unl_stat_802_fall_2017.md=@unl_stat_802_fall_2017,0
+unl_stat_850_fall_2017.md=@unl_stat_850_fall_2017,0
+unl_stat_950_fall_2017.md=@unl_stat_950_fall_2017,0
+unl_stat_alpha_seminar_fall_2017.md=@unl_stat_alpha_seminar_fall_2017,0
+unl_stat802_january_23rd_2017.md=@unl_stat802_january_23rd_2017,0
+june_workshop_series_2017.md=@june_workshop_series_2017,0
+software_carpentry_workshop_unl_january_5_6_2017.md=@software_carpentry_workshop_unl_january_5_6_2017,0
+software_carpentry_workshop_unl_march_27_28_2017.md=@software_carpentry_workshop_unl_march_27_28_2017,0
+unk_linear_algebra_feb_28th_2017.md=@unk_linear_algebra_feb_28th_2017,0