Add Python docs and remove Twitter from promoted results

     $   "developer.mozilla.org": ("https://developer.mozilla.org/favicon-48x48.cbbd161b.png", " | MDN - MDN Web Docs"),
     $   "www.w3.org": ("https://www.w3.org/favicon.ico", " - World Wide Web Consortium (W3C)"),
     $   "stackoverflow.com": ("https://cdn.sstatic.net/Sites/stackoverflow/Img/favicon.ico?v=ec617d715196", " - Stack Overflow"),
-    $   "twitter.com": ("https://abs.twimg.com/favicons/twitter.3.ico", " | Twitter"),
     $   "www.imdb.com": ("https://m.media-amazon.com/images/G/01/imdb/images-ANDW73HA/favicon_desktop_32x32._CB1582158068_.png", " - IMDb"),
+    $   "docs.python.org": ("https://docs.python.org/3/_static/py.svg", " — Python \d\.\d{,2}\.0.+")
     $ }
     $ blocked_sites = (
     $   "www.$tx.host.name",