Fix link typo.
Make path os independent.
Simplify usage with .gitignore

Copying this script to another location stops git from track changes,
so it's better to allow reading user input from within the
respository.
Cleanup script purpose and usage.

- Make file docstring more "pythonic".

- In places I had to take a few liberties with the purpose, since the
  text was ambiguous (e.g. "check for errors" - I interpret this as
  verifyign the output with the webpage, as opposed to, say, a Python
  runtime error).  The original author may need to correct any
  misunderstandings.