bug 1238587 - Remove requirements-rtd.txt
bug 1238587 - Remove requirements-rtd.txt

ReadTheDocs is now configured to look at requirements/readthedocs.txt

mdn/browsercompat,jwhitlock/web-platform-compat,jwhitlock/web-platform-compat,mdn/browsercompat,mdn/browsercompat,jwhitlock/web-platform-compat