Revert "Use rstudio auth-sign-in url."
Revert "Use rstudio auth-sign-in url."

This reverts commit 272224920be683b0ca049335b2d1fa03142347d7.

ryanlovett/datahub,berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub