* Site templates can replace theme templates
* Integrate test case within test_site/
* Full backwards-compatibility with testcase in test_site
* Refine test case
* Call parent's block in child template for test case
* Check both templates are applied
* Follow testing advice
* Test for 'include' in themes and shortcodes
* Documentation for themes and how to extend them
Co-authored-by: Vincent Prouillet <balthek@gmail.com>
* Change the behavior of the template rendering:
* Check if the template bare name is present
* Check if the template is part of a theme
* Fallback to defaults
* Change the behavior of the shortcode rendering:
* Call the template rendering function
* Prepend `__zola_builtins/` to most of the default elements in `ZOLA_TERA`
* Add a test to verify the presence and content of a `404.html` page
from a theme's template
