Recommend pipx for installation

Closes https://github.com/1j01/textual-paint/issues/3

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - `--ascii-only-icons` now uses color, and has been otherwise tweaked to make tools easier to distinguish.
 - `--ascii-only-icons` now affects the icons in the Stretch/Skew dialog, and the Help window icon, not just tool icons.
+- It is now recommended to install using `pipx` instead of `pip`; to switch to `pipx`, run `pip uninstall textual-paint && pipx install textual-paint`.
 
 ### Added
 

README.md

@@ -39,6 +39,13 @@ Python 3.10 or later is required. See [Compatibility](#compatibility) for detail
 
 ### Installation
 
+Use `pipx` to install globally, without installing dependencies globally:
+```bash
+pip install --upgrade pipx  # or in Arch Linux, sudo pacman -S python-pipx
+pipx install textual-paint
+```
+
+Alternatively, you can install using `pip`:
 ```bash
 pip install textual-paint
 ```

cspell.json

@@ -102,6 +102,7 @@
 		"openbox",
 		"Openbox",
 		"osascript",
+		"pacman",
 		"pagedown",
 		"pageup",
 		"palettized",
@@ -109,6 +110,7 @@
 		"performantly",
 		"phpstorm",
 		"pipreqs",
+		"pipx",
 		"Playscii",
 		"polyline",
 		"psutil",