Removed inaccurate statement re library (#6771)

This PR is a self-admitted exercise in pedantry. The previous wording suggested a distinction between the Helm client and Helm library, but from a user perspective the usage of the library is hidden. As a user, I use the Helm client to render my templates and communicate with k8s, so mentioning the library in this section reduces clarity.
Signed-off-by: Mike Ryan <mike@fadedink.co.uk>

README.md

@@ -20,8 +20,7 @@ Use Helm to:
 Helm is a tool that streamlines installing and managing Kubernetes applications.
 Think of it like apt/yum/homebrew for Kubernetes.
 
-- Helm has two parts: a client (`helm`) and a library
-- The library renders your templates and communicates with the Kubernetes API
+- Helm renders your templates and communicates with the Kubernetes API
 - Helm runs on your laptop, CI/CD, or wherever you want it to run.
 - Charts are Helm packages that contain at least two things:
   - A description of the package (`Chart.yaml`)