Re-knit README and installation details

Update pkgdown site for 1.2.1

Update cran-comments, ignore revdep/

Fix vignette building by using static vignettes

CRAN submissions failed because the CRAN process could not build the vignettes, as we did not script the installation of the Python/spaCy/language model process.  The solution was to swtich to static vignettes (built locally) and include them using the R.rsp package.

Update description and cran-comments for CRAN update

CRAN release 0.90