document participation in gsoc 2023

Author: TimidRobot

content/programs/contents.lr

@@ -22,9 +22,12 @@ CC isn't currently participating in Google Season of Docs (GSoD).
 
 ### Google Summer of Code
 
-CC is applying for 2023.
+CC is participating in Google Summer of Code (GSoC) 2023.
 
 - [Program website](https://summerofcode.withgoogle.com/)
+- [CC's GSoC 2023 page][gsoc2023cc]
+
+[gsoc2023cc]: https://summerofcode.withgoogle.com/programs/2023/organizations/creative-commons
 
 
 ### Outreachy