Remove the link to the private CLI source repository

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: joe4dev

README.md

@@ -10,7 +10,7 @@ LocalStack CLI (deprecated)
 > - Migrate local scripts and CI workflows: [docs.localstack.cloud/.../lstk/migration](https://docs.localstack.cloud/aws/developer-tools/running-localstack/lstk/migration/)
 
 This repository contains building instructions for binary builds of the LocalStack CLI.
-It does not contain the actual source for the CLI (see [localstack/localstack-cli-standalone](https://github.com/localstack/localstack-cli-standalone) for the source code), since the LocalStack CLI is basically just the Python package `localstack` (published on PyPi) with it's install dependencies (and without any extras).
+It does not contain the actual source for the CLI, since the LocalStack CLI is basically just the Python package `localstack` (published on PyPi) with it's install dependencies (and without any extras).
 This is why this repository just contains the build config and pipeline that packages the LocalStack CLI python package into a standalone binary using PyInstaller.
 
 ## Installation