docs: cheat sheet not opening (infinite redirect loop)
The pandas cheat sheet (linked from e.g. [getting_started/tutorials.html](https://pandas-docs.github.io/pandas-docs-travis/getting_started/tutorials.html)) fails to open.

Navigate to: https://pandas.pydata.org/Pandas_Cheat_Sheet.pdf

This returns a 301 redirect to the same URL, which causes an infinite redirect loop and makes my browser display ERR_TOO_MANY_REDIRECTS