Updating links to previous editions

iiif-online-workshop/SUMMARY.md

@@ -64,32 +64,10 @@
     - [A basic Video manifest](extras/AVExample.md)
 
 ## Editions of the course
-- [September 2020](September2020.md)
-- [October 2020](October2020.md)
-- [November 2020](November2020.md)
-- [February 2021](February2021.md)
-- [March 2021](March2021.md)
-- [April 2021](April2021.md)
-- [May 2021](May2021.md)
-- [July 2021](July2021.md)
-- [September 2021](September2021.md)
-- [January 2022](January2022.md)
-- [March 2022](March2022.md)
-- [April 2022](April2022.md)
-- [May 2022](May2022.md)
-- [June 2022](June2022.md)
-- [July 2022](July2022.md)
-- [September 2022](September2022.md)
-- [October 2022](October2022.md)
-- [November 2022](November2022.md)
-- [December 2022](December2022.md)
-- [February 2023](February2023.md)
-- [March 2023](March2023.md)
-- [April 2023](April2023.md)
-- [May 2023](May2023.md)
-- [July 2023](July2023.md)
-- [September 2023](September2023.md)
-- [December 2023](December2023.md)
+- [2020 Editions](editions/2020/README.md)
+- [2021 Editions](editions/2021/README.md)
+- [2022 Editions](editions/2022/README.md)
+- [2023 Editions](editions/2023/README.md)
 - [March 2024](March2024.md)
 - [June 2024](June2024.md)
 - [November 2024](November2024.md)