fix images

- crop firefox-unable to connect screenshot so that it's fully readable,
  update port number
- make the google search screenshot larger

Author: Xronophobe

chapter_09_docker.asciidoc

@@ -1140,7 +1140,7 @@ which was a https://stackoverflow.com/questions/49476217/docker-cant-access-djan
 
 [[google-results-screenshot]]
 .Google can still deliver results
-image::images/google-results-with-stackoverflow.png["Google results with a useful stackoverflow post in first position",400]
+image::images/google-results-with-stackoverflow.png["Google results with a useful stackoverflow post in first position",1000]
 
 
 So we need to tell Django to bind to _any_ IP address,