Templates
The templates are read from ~/.config/theris/templates by default. As you'll see in Appliers,
it's also possible to use inline templates in appliers.yaml.
Theris uses a template engine named Tera. It has various features but you probably need just a basic usage. Here is an example:
bg = {{background}}
fg = {{foreground}}
accent = {{blue}}
font = {{font}}
Everything defined in the colors or extra field can be referenced directly using {{}}. For more complex rendering
you should check Tera's documentation.