Create an accordion item to put inside an accordion container
accordionItem(..., id, title = NULL, color = NULL, collapsed = TRUE)
text to write in the item.
unique item id.
item title.
item color: see here for a list of valid colors https://adminlte.io/themes/AdminLTE/pages/UI/general.html.
Whether to expand or collapse the item. TRUE by default. Set it to FALSE if you want to expand it.