They're part of the card now, let's name them that way.
Also, rename the "tag" partial to "tagging", following the naming
convention established by the controller.
- Rearrange the _tags and _tag partial, so they are properly nested concerns
- Add turbo frames for _tags and _tag
- Load _tag in a separate request, so it's not cached with the card
- Cache _tag using the bubble and the account
- New model behavior: touch Account when tags are added or removed
- New controller action: "new" for taggings toggles, which renders the _tag partial
- Updating taggings responds with a turbo stream response that updates the _tags frame
This is very much a parallel change to what was done with assignments
in #317.
Mike Dalessio