chore: prep systemstest (#24514)

tests/systemtests/README.md

@@ -2,7 +2,7 @@
 
 Go black box tests that setup and interact with a local blockchain. The system test [framework](../../systemtests) 
 works with the compiled binary of the chain artifact only.
-To get up to speed, checkout the [getting started guide](../../systemtests/getting_started.md).
+To get up to speed, checkout the [getting started guide](../../systemtests/GETTING_STARTED.md).
 
 Beside the Go tests and testdata files, this directory can contain the following directories:  
 
@@ -33,16 +33,3 @@ cp ./build/simd ./tests/systemtests/binaries/
 ```shell
 go test -v -mod=readonly -failfast -tags='system_test' --run TestStakeUnstake    ./... --verbose
 ```
-
-### Working with macOS
-
-Most tests should function seamlessly. However, the file [upgrade_test.go](upgrade_test.go) includes a **build annotation** for Linux only.
-
-For the system upgrade test, an older version of the binary is utilized to perform a chain upgrade. This artifact is retrieved from a Docker container built for Linux.
-
-To circumvent this limitation locally:
-1. Checkout and build the older version of the artifact from a specific tag for your OS.
-2. Place the built artifact into the `binaries` folder.
-3. Ensure that the filename, including the version, is correct.
-
-With the cached artifact in place, the test will use this file instead of attempting to pull it from Docker.