Fix Version/s: None
Component/s: Stack Documentation and UX
Create a remote-code-block Sphinx directive that mirrors how literal-include works, but permits a URL so that the content is downloaded from an external https URL.
Caching should be included so that docs can be built offline. The intersphinx extension might be a good guide for how to implement caching.
This directive is needed to feature content from https://github.com/lsst/templates in documentation projects like the Developer Guide.
- has to be done before
DM-14782 Switch to sphinx-automodapi package