code: def plugins(all, plugins_dir):
      "List currently available plugins"
      app = Datasette([], plugins_dir=plugins_dir)
      click.echo(json.dumps(app.plugins(all), indent=4)f plugins(all, plugins_dir):
      "List currently available plugins"
      app = Datasette([], plugins_dir=plugins_dir)
      click.echo(json.dumps(app.plugins(all), indent=4))
docs: List currently available plugins