Increase the resolution (dpi) for better quality and change argument --url to prompt

[afandiazmi]

and

• also Set JPEG quality to maximum (100%)
• Remove the '--url' argument from the parser
• Remove the 'args.url' assignment
• Remove the 'id' assignment from the URL
• Add prompt to ask for Prezi Links
• Add prompt to ask for PDF name

[Gertje823]

Hi,
Thanks fot the PR.
When comparing the output between your script and mine I see no difference in quality in the pdf.
The file size is identical and the quality does not seem better.
Did the quality of the pdf files improve in your tests?

Also the --url arguments are used to run the script without user input. Maybe we could implement both.
If you for example don't set the --url argument it will prompt you for a url and else use the url from the --url argument.