Remove content field from ArchWiki results; reformat code in archlinux.py

Content field in Arch Wiki search results is of no real use, more often
than not it contains no usable information and includes too many markup
tags which make the text unreadable. It is safe to remove it.

searx/engines/archlinux.py

@@ -3,12 +3,12 @@
 """
  Arch Linux Wiki
 
- @website	https://wiki.archlinux.org
- @provide-api	no (Mediawiki provides API, but Arch Wiki blocks access to it
- @using-api	no
- @results	HTML
- @stable	no (HTML can change)
- @parse		url, title, content
+ @website      https://wiki.archlinux.org
+ @provide-api  no (Mediawiki provides API, but Arch Wiki blocks access to it
+ @using-api    no
+ @results      HTML
+ @stable       no (HTML can change)
+ @parse        url, title
 """
 
 from urlparse import urljoin
@@ -26,7 +26,6 @@ base_url = 'https://wiki.archlinux.org'
 # xpath queries
 xpath_results = '//ul[@class="mw-search-results"]/li'
 xpath_link = './/div[@class="mw-search-result-heading"]/a'
-xpath_content = './/div[@class="searchresult"]'
 
 
 # cut 'en' from 'en_US', 'de' from 'de_CH', and so on
@@ -135,10 +134,8 @@ def response(resp):
         link = result.xpath(xpath_link)[0]
         href = urljoin(base_url, link.attrib.get('href'))
         title = escape(extract_text(link))
-        content = escape(extract_text(result.xpath(xpath_content)))
 
         results.append({'url': href,
-                        'title': title,
-                        'content': content})
+                        'title': title})
 
     return results