removed old workshop summaries

Author: axel-lauer

_data/events/workshops.yml

@@ -22,65 +22,41 @@
     Agenda: /assets/pdf/ESMValTool_workshop_agenda_Oct_2022.pdf
 - date: [13.06.2022, 15.06.2022]
   venue: Hybrid - DLR, Oberpfaffenhofen, Germany
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_Jun_2022.pdf
 - date: [23.11.2021, 25.11.2021]
   venue: Virtual
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_Nov_2021.pdf
 - date: [04.05.2021, 06.05.2021]
   venue: Virtual
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_May_2021.pdf
 - date: [24.11.2020, 26.11.2020]
   venue: Virtual
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_Nov_2020.pdf
 - date: [09.03.2020, 11.03.2020]
   venue: Virtual
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_Mar_2020.pdf
 - date: [14.10.2019, 16.10.2019]
   venue: DLR, Oberpfaffenhofen, Germany
-  additional_info:
-    Summary: /assets/pdf/Summary_ESMValTool_Workshop_Oct_2019.pdf
 - date: [03.06.2019, 06.06.2019]
   venue: DLR, Oberpfaffenhofen, Germany
-  additional_info:
-    Summary: /assets/pdf/4thTechnicalESMValToolWorkshop_190603.pdf
 - date: [04.02.2019, 07.02.2019]
   venue: SMHI, Norrköping, Sweden
   additional_info:
     Topic: CRESCENDO Diagnostics
-    Summary: /assets/pdf/ESMValTool_Workshop_Summary_201902.pdf
 - date: [06.02.2019, 08.02.2019]
   venue: DLR, Oberpfaffenhofen, Germany
   additional_info:
     Topic: Backend Coding
-    Summary: /assets/pdf/ESMValTool_Workshop_Summary_201902.pdf
 - date: [18.06.2018, 22.06.2018]
   venue: DLR, Oberpfaffenhofen, Germany
-  additional_info:
-    Summary: /assets/pdf/ESMValTool-v2_Workshop2018.pdf
 - date: [15.05.2017, 19.05.2017]
   venue: DLR, Oberpfaffenhofen, Germany
   additional_info:
     Topic: Backend Coding
-    Summary: /assets/pdf/ESMValTool_2ndCodingWorkshopBackend_Summary_1705_Sent.pdf
 - date: [08.05.2017, 12.05.2017]
   venue: LMU, Munich, Germany
   additional_info:
     Topic: Documentation and Visualization
-    Summary: /assets/pdf/ESMValTool_1stCodingWorkshopDocuVisualization_Summary_1705_Sent.pdf
 - date: [06.02.2017, 10.02.2017]
   venue: Met Office, Exeter, UK
   additional_info:
     Topic: Backend Coding
 - date: [15.11.2016, 16.11.2016]
   venue: LMU, Munich, Germany
-  additional_info:
-    Summary: /assets/pdf/201611_TechnicalWorkshopESMValTool_WorkshopSummary.pdf
 - date: [03.03.2015, 04.03.2015]
   venue: LMU, Munich, Germany
-  additional_info:
-    Summary: /assets/pdf/201503_TechnicalWorkshopESMValTool_WorkshopSummary.pdf