Add support for slashes in branch names

[FoxRefire]

Fixes https://github.com/download-directory/download-directory.github.io/issues/35

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[FoxRefire]

Test case: https://github.com/PaperMC/Paper/tree/feature/daemon/scripts

https://deploy-preview-107--preview-for-download-directory-github-io.netlify.app/?url=https%3A%2F%2Fgithub.com%2FPaperMC%2FPaper%2Ftree%2Ffeature%2Fdaemon%2Fscripts

[FoxRefire]

@fregante

[fregante]

Thank you so much! I'll eventually need to make large changes to download-directory but this will be enough for the time being.

Some of the changes would be:

• don't pass ref/dir, just alter repoListingConfig
• don't extract ref/dir in the regex, just extract a single parameter and then verify it in repoListingSlashblanchSupport
• log the final ref/dir, not just the result of the regex
• rename repoListingSlashblanchSupport to fetchFileList (I forgot to do it before meting 😅)