docs: encourage python install using pipx (#1207)

Author: franzramadhan

README.md

@@ -46,7 +46,7 @@ gem install lefthook
 For **Python**:
 
 ```bash
-pip install lefthook
+pipx install lefthook
 ```
 
 **[Installation guide][installation]** with more ways to install lefthook: [apt][install-apt], [brew][install-brew], [winget][install-winget], and others.

docs/mdbook/installation/python.md

@@ -6,4 +6,8 @@ python -m pip install --user lefthook
 
 ```sh
 uv add --dev lefthook
-```
+```
+
+```sh
+pipx install lefthook
+```