Update README.md

Author: rainleander

README.md

@@ -7,11 +7,8 @@ Build a poker game that demonstrates the value of Temporal and helps me get to k
 - [x] deal
 - [x] score
 - [x] single player game 
-- [ ] [foundations](https://docs.temporal.io/application-development/foundations) [in progress]
-- [ ] [features](https://docs.temporal.io/application-development/features)
-- [ ] [observability](https://docs.temporal.io/application-development/observability)
-- [ ] [testing](https://docs.temporal.io/application-development/testing)
-- [ ] [worker performance](https://docs.temporal.io/application-development/worker-performance)
+- [ ] [workflow](https://docs.temporal.io/application-development/foundations) [in progress]
+- [ ] [activities](https://docs.temporal.io/application-development/features)
 - [ ] upgrade: two player game score
 - [ ] upgrade: bet function