update react to 17.0.0 and prepare for CRAN#51

Merged

timelyportfolio merged 14 commits intomasterfrom

Feb 22, 2021

Commits on Feb 16, 2021

Commits on Feb 21, 2021

fix another link for CRAN
timelyportfolio
committed

Commits on Feb 22, 2021

fix new problematic link found in latest cran check; re-pkgdown
timelyportfolio
committed