Added in-built slugify function (removes github slugify dependecy)

man/htmlAddBoxHelpLink.Rd

@@ -18,9 +18,7 @@ The modified box
 }
 \description{
 The uri to load can have a replacement marker supplied '\%box\%' which will be
-substituded with a sanitized copy of the box title. Preference is given to
-the slugify package, however if unavailable a warning is generated and the
-fallback of URLEncode is used.
+substituded with a sanitized copy of the box title.
 }
 \examples{
 x <- shinydashboard::box(title = "This is a box")