Allow to block any page containing a word

[penge]

Before

Trailing / was automatically added:

example.com    # same as example.com/

But it prevented to match by word:

*watch*        # should block https://www.youtube.com/watch?v=123456
               # but *watch* was changed to *watch*/
               # so there was no match

Now

Trailing / is NOT automatically added. Need to write:

example.com/

Which fixes matching by word:

*watch*        # will block https://www.youtube.com/watch?v=123456

Other changes:

• updating README (adding section Special characters, updating Examples)
• improving look of blocked info page (better contrast, moving count to the end of message)