Argument parsing improvements

[NicPWNs]

Hey! I attended your talk at BSidesDE and have been using the tool. Very cool. I've seen a few minor things that I thought I'd try to contribute with. Let me know if you have any questions. Here's the proposed changes:

1. Add support for parsing full URLs like https://sub.example.com/page to sub.example.com. This makes copy/paste from browsers easier.
2. When no -- arguments were provided the script just returned with no output. Added printing of the usage when this happens.
3. Added a .gitignore to prevent uploading the /content directory.
4. Cleaned up some whitespace.
5. Removed unused/duplicate imports.
6. Removed unused numpy and fixed PyJWT capitalization in requirements.txt.