docs: update english version of webGR URL in README and package help page

README.md

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 ## Overview
 
-'airGRdatassim' is a package based on the 'airGR' hydrological modeling package. It provides the tools to assimilate observed discharges in the GR daily hydrological model (GR4J, GR5J and GR6J, with and without the CemaNeige snow model). The package is developed at INRAE-Antony ([Catchment Hydrology research group](https://webgr.inrae.fr/en/home/) of the HYCAR Research Unit, France). More information about the efficiency of these data assimilation schemes with GR5J can be found in Piazzi et al. (2021)
+'airGRdatassim' is a package based on the 'airGR' hydrological modeling package. It provides the tools to assimilate observed discharges in the GR daily hydrological model (GR4J, GR5J and GR6J, with and without the CemaNeige snow model). The package is developed at INRAE-Antony ([Catchment Hydrology research group](https://webgr.inrae.fr/eng) of the HYCAR Research Unit, France). More information about the efficiency of these data assimilation schemes with GR5J can be found in Piazzi et al. (2021)
 
 
 ## Installation

man/airGRdatassim.Rd

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 \description{
-\packageDescription{airGRdatassim} airGRdatassim currently runs on daily hydrological models (GR4J, GR5J and GR6J, with and without the CemaNeige snow model). The package is developed at INRAE-Antony (\href{https://webgr.inrae.fr/en/home/}{Catchment Hydrology research group} of the HYCAR Research Unit, France). More information about the efficiency of these data assimilation schemes with GR5J can be found in Piazzi et al. (2021). \cr\cr
+\packageDescription{airGRdatassim} airGRdatassim currently runs on daily hydrological models (GR4J, GR5J and GR6J, with and without the CemaNeige snow model). The package is developed at INRAE-Antony (\href{https://webgr.inrae.fr/eng}{Catchment Hydrology research group} of the HYCAR Research Unit, France). More information about the efficiency of these data assimilation schemes with GR5J can be found in Piazzi et al. (2021). \cr\cr
 
 
 ## --- Functions and objects