Remove mention of binary releases from README

We're no longer using goreleaser, so we're not releasing binaries.

README.md

@@ -73,8 +73,6 @@ For the Linux binary on WSL2, you can use the same command as for Linux.
 
 ### Install xk6
 
-You can [download binaries](https://github.com/grafana/xk6/releases) that are already compiled for your platform, or build `xk6` from source:
-
 ```bash
 $ go install go.k6.io/xk6/cmd/xk6@latest
 ```
@@ -84,8 +82,6 @@ This will install the `xk6` binary in your `$GOPATH/bin` directory.
 If you're getting a `command not found` error when trying to run `xk6`, make sure that you precisely follow the [Go installation instructions](https://go.dev/doc/install) for your platform.
 Specifically, ensure that the `$GOPATH/bin` directory is part of your `$PATH`. For example, you might want to add this to your shell's initialization file: `export PATH=$(go env GOPATH)/bin:$PATH`. See [this article](https://go.dev/doc/gopath_code#GOPATH) for more information.
 
-If you're still struggling with this, consider downloading a pre-built binary from [our releases page](https://github.com/grafana/xk6/releases), and placing the binary in a directory already part of your `$PATH`.
-
 
 ## Command usage