Add Shewchuk offerings

Author: tejasprabhune

index.md

@@ -19,29 +19,26 @@ This class covers theoretical foundations, algorithms, methodologies, and applic
 <!-- TODO: Add previous course offerings. (We can't do this the way Data100 has been. I know how to link all the Spring versions, but I'd have to hunt down Fall versions.) -->
 
 ## Offerings
-1. [Spring 2025](sp25)
+1. [Spring 2025](https://people.eecs.berkeley.edu/~jrs/189s25/)
 1. [Fall 2024](fa24)
-1. [Summer 2024](su24)
-1. [Spring 2024](sp24)
-1. [Fall 2023](fa23)
-1. [Summer 2023](su23)
-1. [Spring 2023](sp23)
+1. [Spring 2024](https://people.eecs.berkeley.edu/~jrs/189s24/)
+1. [Fall 2023](https://eecs189.org/)
+1. [Spring 2023](https://people.eecs.berkeley.edu/~jrs/189s23/)
 1. [Fall 2022](fa22)
-1. [Summer 2022](su22)
-1. [Spring 2022](sp22)
+1. [Spring 2022](https://people.eecs.berkeley.edu/~jrs/189s22/)
 1. [Fall 2021](fa21)
-1. [Summer 2021](su21)
-1. [Spring 2021](sp21)
+1. [Spring 2021](https://people.eecs.berkeley.edu/~jrs/189s21/)
 1. [Fall 2020](fa20)
-1. [Summer 2020](su20)
-1. [Spring 2020](sp20)
+1. [Spring 2020](https://people.eecs.berkeley.edu/~jrs/189s20/)
 1. [Fall 2019](fa19)
-1. [Summer 2019](su19)
-1. [Spring 2019](sp19)
+1. [Spring 2019](https://people.eecs.berkeley.edu/~jrs/189s19/)
 1. [Fall 2018](fa18)
-1. [Spring 2018](sp18)
+1. [Spring 2018](https://eecs189.org/sp18/)
 1. [Fall 2017](fa17)
-1. [Spring 2017](sp17)
+1. [Spring 2017](https://people.eecs.berkeley.edu/~jrs/189s17/)
+1. [Fall 2016](fa17)
+1. [Spring 2016](https://people.eecs.berkeley.edu/~jrs/189s16/)
+1. [Fall 2015](fa17)
 
 
 ### Goals