Add pipx to installation documentation #756
Description
Add to this page: https://datasette.readthedocs.io/en/stable/installation.html
Here's how to install plugins: https://twitter.com/simonw/status/1257348687979778050
$ datasette plugins
[]
$ pipx inject datasette datasette-json-html
injected package datasette-json-html into venv datasette
done! ✨ 🌟 ✨
$ datasette plugins
[
{
"name": "datasette-json-html",
"static": false,
"templates": false,
"version": "0.6"
}
]