[fix] geektimes.ru xpath fix

searx/settings.yml

     engine : xpath
     paging : True
     search_url : https://geektimes.ru/search/page{pageno}/?q={query}
-    url_xpath : //div[@class="search_results"]//a[@class="post__title_link"]/@href
-    title_xpath : //div[@class="search_results"]//a[@class="post__title_link"]
-    content_xpath : //div[@class="search_results"]//div[contains(@class, "content")]
+    url_xpath : //article[contains(@class, "post")]//a[@class="post__title_link"]/@href
+    title_xpath : //article[contains(@class, "post")]//a[@class="post__title_link"]
+    content_xpath : //article[contains(@class, "post")]//div[contains(@class, "post__text")]
     categories : it
     timeout : 4.0
     disabled : True