Add jinja2 extension for yield tag, allow _render_path to generate multiple paths and contexts when yield tag is used.
The tag is only allowed in path render contexts. When rendering within a file, it doesn't make sense. Use the normal for tag there. If you use yield, you'll get an exception.
Fixes https://github.com/copier-org/copier/issues/1271
- Prepare for a new release.
- Add configuring page, with more explicit docs and examples for each option.
- Remove configuration stuff from creation page.
- Comparisons are ugly, so remove them from the index page.
