fix: convert repo, user and branch to param-case

[JoshBarr]

👋 hey, thanks for writing this great library!

I encountered an issue if my repository contained a . character, for instance mysite.com. The output URL would be mysite.com-1234.vercel.app, which isn't a valid domain.

I also encountered an issue if my branch contained a / character, for instance ci/pipeline. The output would be myrepo-ci/pipeline.vercel.app, which isn't a valid domain either.

This PR imports paramCase from change-case and converts these values into URL-safe equivalents.

[BetaHuhn]

Thanks for the PR!

Could you please remove the editorconfig and the prettier file.

Also, making the values URL safe seems like something a simple regex could do without the need to add a new dependency.

[BetaHuhnBot]

⚠️ This PR has not seen any activity in the past 2 months so I'm marking it as stale. I'll close it if it doesn't see any activity in the coming week.