Add check for external version in conf.py.tmpl for warning banner #5900
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This will add a warning banner to external version docs.
To use this we need to add this in the requirements as its not merged
git+https://github.com/saadmk11/readthedocs-sphinx-ext/@external-version-warning
Sphinx Extension PR: readthedocs/readthedocs-sphinx-ext#72