Amend docs about macOS (#1135)

* Amend docs about macOS

Remove misleading suggestion that it works on ARM

* update

README.md

@@ -33,13 +33,9 @@ Follow this guide <https://docs.github.com/en/packages/working-with-a-github-pac
 1. Run `export CR_PAT=YOUR_TOKEN` (replace `YOUR_TOKEN` with the token)
 1. Run `echo $CR_PAT | docker login ghcr.io -u USERNAME --password-stdin` (Not sure what to put as username, just leaving it as `USERNAME` seemed to work)
 
-### (ARM macOS only): Configure docker default architecture
+### ARM macOS
 
-If you are running on an ARM macOS machine, you need to configure docker to use the `linux/amd64` architecture by default to work with images pushed by others. To do this, run:
-
-```bash
-export DOCKER_DEFAULT_PLATFORM=linux/amd64
-```
+Unfortunately, local development on ARM macOS (M1 and M2 macs) is not currently possible as it requires images which are not built for ARM. You can develop in a GitHub codespace instead.
 
 ## Authorization
 

kubernetes/README.md

@@ -159,7 +159,9 @@ eyXXXXXX%
 
 This will return a base64 encoded string similar to the one you can see above that starts with `ey` that you can use as `--dockerconfigjson` argument. Make sure not to copy the trailing `%` character that is added by `zsh`.
 
-### How to set up locally on ARM64 macOS (M1, M2, etc.)
+### How to set up on ARM64 macOS (M1, M2, etc.)
+
+**We recommend using GitHub Codespaces if you are using ARM64 macOS, as the approach below is too slow.** 
 
 Using Docker desktop as your container runtime won't work on ARM64 macOS. Instead, you will need to use `colima` to run an AMD64 VM which will host AMD64 docker containers.