Move ids poster to posterdown_ids and restore original posterdown_html

Change-Id: Ib44b4020134c403a2946d0fc4b79777e9ecbe3ac
diff --git a/inst/rmarkdown/templates/posterdown_ids/template.yaml b/inst/rmarkdown/templates/posterdown_ids/template.yaml
new file mode 100644
index 0000000..8f18b28
--- /dev/null
+++ b/inst/rmarkdown/templates/posterdown_ids/template.yaml
@@ -0,0 +1,4 @@
+name: Posterdown IDS
+description: >
+ Template for creating R Markdown based PDF via HTML and CSS
+create_dir: true