Change file_name from uuid to highlight_name

[lentsd]

Made file_name readable, so i can read first highlight letters instead of hash

Issue: #7

[lenalebt]

Hey, thanks for your contribution!
I'm not opposed to the change in general, but I do also think that this change comes with a few challenges that may not be easy to spot. File systems disallow some characters in file names, and what these are also differs between different OSes. In addition to that, spaces in filenames also can be troublesome in some contexts, not to speak of the different forms of quotations.

I'd suggest to add an allowlist of characters that definitely may be used in filenames (e.g. all alphanumeric characters). I did not want to bother with those special cases, that is why I did not put a quotation in the file name in the first place 🙃 ... What do you think?

[lentsd]

Yes, I will update my pull later with a whitelist and logic for escaping bad characters