Improve Express scraper

Closes #606.

lib/docs/filters/express/clean_html.rb

@@ -2,6 +2,13 @@ module Docs
   class Express
     class CleanHtmlFilter < Filter
       def call
+        i = 1
+        n = at_css("#navmenu a[href='#{result[:path].split('/').last}']").parent
+        i += 1 while n && n = n.previous_element
+        at_css('h1')['data-level'] = i
+
+        @doc = at_css('#api-doc, .content')
+
         css('section', 'div.highlighter-rouge').each do |node|
           node.before(node.children).remove
         end

lib/docs/filters/express/entries.rb

@@ -4,11 +4,14 @@ module Docs
       TYPES_BY_PATH = {
         'starter' => 'Getting started',
         'guide' => 'Guide',
-        'advanced' => 'Guide'
+        'advanced' => 'Advanced topics'
       }
 
       def get_name
-        at_css('h1').content
+        node = at_css('h1')
+        name = node.content
+        name.prepend "#{node['data-level']}. " if type.in?(%w(Guide Getting\ started Advanced\ topics))
+        name
       end
 
       def get_type
@@ -19,7 +22,7 @@ module Docs
         return [] unless root_page?
         type = 'Application'
 
-        doc.children.each_with_object [] do |node, entries|
+        at_css('#api-doc').children.each_with_object [] do |node, entries|
           if node.name == 'h2'
             type = node.content
             entries << [type, node['id'], 'Application'] if type == 'Middleware'

lib/docs/scrapers/express.rb

@@ -18,7 +18,6 @@ module Docs
 
     options[:title] = false
     options[:root_title] = 'Express'
-    options[:container] = ->(filter) { filter.root_page? ? '#api-doc' : '.content' }
 
     options[:only_patterns] = [
       /\Astarter/,