Replace deprecated `slapos.recipe.template:jinja2` options:
- `rendered = <path>`     -> `output = <path>`
- `template = <path>`     -> `url = <path>`
- `template = inline:...` -> `inline = ...`

Favor `slapos.recipe.template` over `slapos.recipe.template:jinja2`
now that they both have `inline` option.