R/modify_backgroundjs.R
    modify_background_js.RdModify background.js to include the call to the shiny app
modify_background_js(background_js_path, my_package_name, function_name, r_path)
| background_js_path | path to the final background.js, not the one in inst/...  | 
    
|---|---|
| my_package_name | package name, will be used for namespacing- (e.g. 'dplyr' in 'dplyr::filter()')  | 
    
| function_name | function that runs your shiny app - (e.g. 'filter' in 'dplyr::filter()')  | 
    
| r_path | path from "r_lang" folder to the R/Rscript executable  | 
    
none, side effect