Add help icon

app/fonts/taiga.svg

@@ -49,4 +49,9 @@
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 </font></defs></svg>

app/styles/layout/typography.scss

@@ -252,3 +252,6 @@ a:visited {
 .icon-video:before {
     content: 'P';
 }
+.icon-help:before {
+    content: 'U';
+}