[enh] engines: add about variable

move meta information from comment to the about variable
so the preferences, the documentation can show these information

searx/engines/startpage.py

@@ -1,14 +1,7 @@
-#  Startpage (Web)
-#
-# @website     https://startpage.com
-# @provide-api no (nothing found)
-#
-# @using-api   no
-# @results     HTML
-# @stable      no (HTML can change)
-# @parse       url, title, content
-#
-# @todo        paging
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+ Startpage (Web)
+"""
 
 from lxml import html
 from dateutil import parser
@@ -19,6 +12,16 @@ from babel import Locale
 from babel.localedata import locale_identifiers
 from searx.utils import extract_text, eval_xpath, match_language
 
+# about
+about = {
+    "website": 'https://startpage.com',
+    "wikidata_id": 'Q2333295',
+    "official_api_documentation": None,
+    "use_official_api": False,
+    "require_api_key": False,
+    "results": 'HTML',
+}
+
 # engine dependent config
 categories = ['general']
 # there is a mechanism to block "bot" search