Switch TODO to be a quote syntax to avoid shortcodes

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/_default/_markup/render-blockquote.html

@@ -0,0 +1,9 @@
+{{ if and (eq .Type "alert") (eq .AlertType "todo") -}}
+<div style="background-color: tomato; color: white; padding: 10px;">
+    <em>TODO: </em>{{- .Text | plainify -}}
+</div>
+{{- else -}}
+<blockquote {{- with .Attributes.id }} id="{{ . }}"{{ end }}>
+{{ .Text -}}
+</blockquote>
+{{- end }}

layouts/shortcodes/todo.html

@@ -1,3 +0,0 @@
-<div style="background-color: tomato; color: white; padding: 10px;">
-    <em>TODO: </em>{{- .Inner -}}
-</div>