add icon settings for asciidoc. next-l/enju_leaf#1934

Author: masao

_includes/themes/twitter/default.html

@@ -14,6 +14,7 @@
     <link href="{{ ASSET_PATH }}/css/enju-manual-patch.css" rel="stylesheet" type="text/css" media="all">
     <link href="{{ ASSET_PATH }}/css/highlight.css" rel="stylesheet" type="text/css" media="all">
     <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet">
+    <link href="{{ ASSET_PATH }}/css/admonitionblock-icon.css" rel="stylesheet" type="text/css" media="all">
 
     <!-- Le fav and touch icons -->
   <!-- Update these with your own images

assets/themes/twitter/css/admonitionblock-icon.css

@@ -0,0 +1,33 @@
+span.icon > .fa {
+  cursor: default;
+}
+.admonitionblock td.icon {
+  text-align: center;
+  width: 80px;
+}
+.admonitionblock td.icon [class^="fa icon-"] {
+  font-size: 2.5em;
+  text-shadow: 1px 1px 2px rgba(0,0,0,.5);
+  cursor: default;
+}
+.admonitionblock td.icon .icon-note:before {
+  content: "\f05a";
+  color: #19407c;
+}
+.admonitionblock td.icon .icon-tip:before {
+  content: "\f0eb";
+  text-shadow: 1px 1px 2px rgba(155,155,0,.8);
+  color: #111;
+}
+.admonitionblock td.icon .icon-warning:before {
+  content: "\f071";
+  color: #bf6900;
+}
+.admonitionblock td.icon .icon-caution:before {
+  content: "\f06d";
+  color: #bf3400;
+}
+.admonitionblock td.icon .icon-important:before {
+  content: "\f06a";
+  color: #bf0000;
+}