remove `teal.code`'s dependency

[chlebowa]

teal.code Imports shiny. The only use seems to be

include_css_files <- function(pattern = "*") {
  css_files <- list.files(
    system.file("css", package = "teal.code", mustWork = TRUE),
    pattern = pattern, full.names = TRUE
  )
  if (length(css_files) == 0) {
    return(NULL)
  }

  shiny::singleton(lapply(css_files, shiny::includeCSS))
}

I say we drop shiny from dependencies. Please review other dependencies if we can drop any.

[chlebowa]

I believe styler and lifecycle can be dropped as well.

[gogonzo]

lifecycle not - it is need in imports to support badges

[chlebowa]

But there aren't any. Unless we expect to add some, then yes.

[m7pr]

remove teal.code or remove shiny?

[vedhav]

Looks like include_css_files is residual code along with the CSS file debug_info_fa.css which was evidently used by get_eval_details_ui(). So I guess they can go as well.