Move ids poster to posterdown_ids and restore original posterdown_html

Change-Id: Ib44b4020134c403a2946d0fc4b79777e9ecbe3ac
diff --git a/R/posterdown_html.R b/R/posterdown_html.R
index c9d035d..e391b92 100644
--- a/R/posterdown_html.R
+++ b/R/posterdown_html.R
@@ -19,6 +19,30 @@
 	pagedown::poster_relaxed(..., css = css, template = template)
 }
 
+#' Posterdown IDS-CD based on HTML format (using pagedown::poster_relaxed)
+#'
+#' @inheritParams pagedown::poster_relaxed
+#' @param ... Additional arguments to `rmarkdown::html_document`
+#'
+#' @return R Markdown output format to pass to
+#'   [rmarkdown::render()]
+#'
+#'@examples
+#'\donttest{
+#'file <- file.path(tempdir(),"foo.rmd")
+#'rmarkdown::draft(file, template="posterdown_ids", package="posterdown")
+#'}
+#'
+#' @description The output format `poster_ids()` mimics the IDS Mannheim
+#' corporate design posters.
+#' @rdname posterdown_html
+#' @export
+posterdown_ids <- function(...,
+                            template = find_resource("posterdown_ids", "template.html"),
+                            css = NULL) {
+  pagedown::poster_relaxed(..., css = css, template = template)
+}
+
 #' @description The output format `poster_betterland()` mimics the style of the
 #' BetterPoster movement from twitter.
 #' @rdname posterdown_html