Automatically load token and remove `--token` option

[TechWiz-3]

Personally, I also have an opinion about the use of --token flag. I believe the CLI should automatically load the token even if the --token flag is not specified and read from UNFOLLOW_TOKEN. That can be another issue @TechWiz-3 if you want.

Originally posted by @tintinthong in https://github.com/TechWiz-3/who-unfollowed-me/issues/29#issuecomment-1272768920

• [ ] Automatically load token
• [ ] If successfully loaded ensure that HEADERS is assigned correctly
• [ ] If UNFOLLOW_TOKEN is empty or cannot be loaded, assign HEADERS to an empty dict

[Dinoosawruss]

Happy to take this if nobody else is working on it

[TechWiz-3]

Sure :) 💪

[TechWiz-3]

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