Default to ids theme

Change-Id: I83c57a86247c1cca7d350ae2b101eb2bf03b8d14
diff --git a/R/revealjs_presentation.R b/R/revealjs_presentation.R
index 178a08c..47f4073 100644
--- a/R/revealjs_presentation.R
+++ b/R/revealjs_presentation.R
@@ -138,8 +138,8 @@
                                   fig_height = 6,
                                   fig_retina = if (!fig_caption) 2,
                                   fig_caption = FALSE,
-                                  self_contained = TRUE,
-                                  theme = "simple",
+                                  self_contained = FALSE,
+                                  theme = "ids",
                                   transition = "convex",
                                   background_transition = "fade",
                                   reveal_options = NULL,