Strip extra HTML from guides TOC.

Some titles contain links, resulting in links-inside-links which is of
no good.

lib/jsduck/guides.rb

@@ -111,8 +111,9 @@ module JsDuck
       html.each_line do |line|
         if line =~ /^<h2>(.*)<\/h2>$/
           i += 1
-          toc << "<li><a href='#!/guide/#{guide['name']}-section-#{i}'>#{$1}</a></li>\n"
-          new_html << "<h2 id='#{guide['name']}-section-#{i}'>#{$1}</h2>\n"
+          text = strip_tags($1)
+          toc << "<li><a href='#!/guide/#{guide['name']}-section-#{i}'>#{text}</a></li>\n"
+          new_html << "<h2 id='#{guide['name']}-section-#{i}'>#{text}</h2>\n"
         else
           new_html << line
         end
@@ -151,6 +152,9 @@ module JsDuck
       "guides/" + guide["name"] + "/icon.png"
     end
 
+    def strip_tags(str)
+      str.gsub(/<.*?>/, "")
+    end
   end
 
 end