Update RTD site to redirect to RAPIDS docs

[charlesbluca]

Taking @jakirkham's suggestion for handling RTD redirects to an external site.

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[pentschev]

LGTM, thanks @charlesbluca .

@jakirkham could you also take a look?

[jakirkham]

Yep looks good. Had one suggestion above. Thanks for working on this Charles 😄

[charlesbluca]

Thanks @jakirkham! Based on that suggestion, we should also probably update the copyright of the main docs as well - would you be okay with using datetime to update this automatically? Something like

copyright = "2020-%s, NVIDIA" % datetime.datetime.now().year

[jakirkham]

Agreed that is better :)

[jakirkham]

@gpucibot merge

[jakirkham]

Manually started a build on RTD. Passed without issues. The redirect seems to be working 🎉

[jakirkham]

Thanks Charles! 😄