fix command for setting up pre-commit hooks in github-template scaffo…

…lded file

- brought to attention by Danny Lloyd ([email protected]) in ESGF/esgf-playground-utils#19

bs-demo/entities/template/github_content/CONTRIBUTING.md

@@ -27,7 +27,7 @@ foo@bar:~$ poetry install
 Then, activate the `pre-commit hooks` run:
 
 ``` shell
-foo@bar:~$ poetry run install pre-commit
+foo@bar:~$ poetry run pre-commit install
 ```
 
 When you commit, the following checks will be run: