We use `redis_client.delete` to delete multiple keys at once, but this
raises a `redis.exceptions.ResponseError` if it is called with an empty list
or set. We should only call `redis_client.delete` when there is at least
one item to delete.
- Add a GET / POST view: manage template folder
- Add a template for that view, where a user can rename their
folder
- Add an API client method for updating a folder
- Test the new feature, including the test that service without
permissions cannot manage a folder
This commit adds logic to:
- take the list of selected folders and templates
- split it into two lists (of folders and templates)
- `POST` that data to the API, to effect the movement of said folders
and templates
I’ve tried to architect it in such a way that we can easily add more
template ‘operations’ in the future, as we add more forms to the choose
template page.
The add new templates page now has option to add template folders.
Tweaked wording of other options and h1 to clarify options since it's
not all about templates any more.
Added api client and stuff for it
