Update readme

Author: zph

README.md

@@ -21,11 +21,6 @@ In this context, a runbook is a mixture of markdown and executable code that con
    1. One to execute the book
    2. A second to validate and perform safety checks
 
-## Installation
-
-Use [pipx](https://github.com/pypa/pipx)
-`pipx install git+https://github.com/zph/runbook.git@main`
-
 ## Workflow
 
 1. Initialize a new folder project with `runbook init...`