DX-874 Restored linking headers anchors

_plugins/headers_anchors.rb

@@ -0,0 +1,13 @@
+require 'nokogiri'
+
+# Adds linkable anchors for documentation headers
+class Kramdown::Converter::Html
+  def convert_header(el, indent)
+    text = el.options[:raw_text]
+    level = el.options[:level]
+    anchor = Nokogiri::HTML(text).text.gsub(/[^a-zA-Z0-9\-_]/, "").downcase
+
+    "<a class=\"anchor\" id=\"#{anchor}\"></a>" +
+        "<h#{level}><a class=\"anchorable\" href=\"##{anchor}\">#{text}</a></h#{level}>"
+  end
+end