Add many more examples to attrs.html
I’d like to have a lot more examples on the attrs.html page, ideally with source code next to the rendered SVG output. I’m particularly inspired by the Ansible documentation which has many examples for every module that you can usually copy/paste, for example, https://docs.ansible.com/ansible/latest/modules/copy_module.html.
This may necessiate breaking attrs.html up into a page per attribute, with examples of how to use it. It might be too large if we don’t break it up (this might be controversial - we can always have both a one-page and many-page version)