Minimum R dependency is 4.5.0 (was 4.3.0).
Added installation instructions specifically for a private GitHub repo for this package.
Added the functions ro_gg_axis, ro_gg_group_ticks, ro_gg_plot, ro_gg_remove_axis_gaps, ro_gg_save, ro_gg_theme,ro_gg_y_title.
Added tests for ro_ggplot, ro_gg_axis, ro_gg_group_ticks, ro_gg_remove_axis_gap, ro_gg_save, ro_gg_theme, ro_gg_y_title.
Added vignettes on getting started with ROvis.ggplot2 and the RIVM style.