Broken links to layout YAMLs in documentation

[Morkvaghr]

The links on https://squib.readthedocs.io/en/latest/layouts.html?highlight=layouts are broken.

To Reproduce
Steps to reproduce the behaviour:

• go to https://squib.readthedocs.io/en/latest/layouts.html?highlight=layouts
• click for example
  https://github.com/andymeneely/squib/tree/master/lib/squib/layouts/hand.yml
  under
  https://squib.readthedocs.io/en/latest/layouts.html#hand-yml
• expect to see the YAML file, find a 404