Update install.R (learnitdown with correct Shiny app run_app() and corrected outils learnr in BioDataScience1)

Update .config/dictionaries/en_GB.dic_delta, .config/dictionaries/en_US.dic_delta, .config/dictionaries/fr_FR.dic_delta, .config/snippets/r.snippets, .config/credentials, .config/rstudio-prefs.json, .config/user_data, .config/.Rprofile, .Rprofile, post-init.sh files
Deleted R/github_init.R, R/github_restore.R, R/github_save.R, R/test.R files