Link to static asset is broken for code blocks in the root_doc #121
Description
Describe the bug
The code uses ${DOCUMENTATION_OPTIONS.URL_ROOT} to locate the static file. However, that is # for the root_doc when building on RTD (likely with dirhtml). This means that the link for the static asset is changed to #_static/copy-button.svg, which doesn't work.
To Reproduce
Steps to reproduce the behavior:
- Build any Sphinx documentation with a code block in root_doc, and host it on RTD.
- See missing image.
See https://cpython-devguide--679.org.readthedocs.build/ for example.
Expected behavior
The link to the image should be _static/copy-button.svg.
Environment
See https://readthedocs.org/projects/cpython-devguide/builds/13630239/, which is about as much as I know. :)
Additional context
Cross-referencing with python/devguide#679, because... why not. :)