fix katex, 1 new shortcode, various fixes

layouts/shortcodes/blockquote.html

@@ -2,5 +2,5 @@
   <p>
     {{ .Inner | markdownify }}
   </p>
-  <footer>{{ .Get "footer" }}</footer>
-</blockquote>
+  <footer>{{ .Get "footer" }}{{ with .Get "cite" }}, <cite>{{ . }}</cite>{{ end }}</footer>
+</blockquote>

layouts/shortcodes/cols.html

@@ -0,0 +1,12 @@
+{{ $cols := split .Inner "||" }}
+
+{{ $lang := .Get "lang" | default ( .Get 0 ) }}
+{{ $lang := split $lang "," }}
+
+<span class="row">
+{{ range $indCol,$col := $cols }}
+   <span class="column" {{ with $lang }} lang="{{ index $lang $indCol }}"{{ end }}>
+   {{ . | $.Page.RenderString (dict "display" "block") }}
+   </span>
+{{ end }}
+</span>

layouts/shortcodes/epigraph.html

@@ -11,5 +11,5 @@
 {{ with .Get "post" }}{{ . }}{{ end }}
 </footer>
 {{ end }}
-<blockquote>
+</blockquote>
 </div>