add posterdown_betterport

portrait template for better poster design has been added

- support for longer author list if needed, can specify various authors to be highlited in the begining of the list.

- better responsiveness to spacing when changinf poster size

-  may need to go back and ensure YAML options amon all templates are more standardized.
diff --git a/man/posterdown_html.Rd b/man/posterdown_html.Rd
index 8c9f7fe..e2ae67b 100644
--- a/man/posterdown_html.Rd
+++ b/man/posterdown_html.Rd
@@ -3,6 +3,7 @@
 \name{posterdown_html}
 \alias{posterdown_html}
 \alias{posterdown_betterland}
+\alias{posterdown_betterport}
 \title{Posterdown HTML format (using bookdown::html_document2)}
 \usage{
 posterdown_html(..., template = find_resource("posterdown_html",
@@ -11,6 +12,10 @@
 posterdown_betterland(...,
   template = find_resource("posterdown_betterland", "template.html"),
   css = NULL)
+
+posterdown_betterport(...,
+  template = find_resource("posterdown_betterport", "template.html"),
+  css = NULL)
 }
 \arguments{
 \item{...}{Additional arguments to \code{rmarkdown::html_document}}
@@ -26,6 +31,9 @@
 \description{
 The output format \code{poster_betterland()} mimics the style of the
 \dQuote{BetterPoster} movement from twitter.
+
+The output format \code{poster_betterport()} mimics the style of the
+\dQuote{BetterPoster} movement from twitter.
 }
 \examples{