docs: show PR warning banner and fix links doc source pages #1521
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This fixes a few issues with the RTD doc building:
This works by passing the RTD environment variables to the sphinx build process, which allows the conf.py file to get their values. Env vars are passed by a new flag,
--//sphinxdocs:extra_env
, which allows passing arbitrary environment variable values into the sphinx build process. To make future usage of the RTD env vars easier, the build process passes along all theREADTHEDOCS*
environment variables.Fixes #1516