It doesn't really exist yet. It's an aspiration by someone who thinks Calibre is slow and awkward (it's not) and it doesn't look like the person has much experience.
A lot of discussion there by people that either don't how to work Calibre, or don't understand what it does.
Calibre isn't a multi-user library system, like a lending library or video library has. Nor is it a document management system for offices. It's primarily to manage ebooks (and thus ebook metadata) for an ereader for one person, though it can do more. The conversion, epub editor and viewer are important tools to complement the basic ebook repository, metadata editor and transfer features. The 3rd party plugins make it an even more useful tool.
There is nothing wrong with the calibre GUI for what it is that it does.
I predict Citadel will never make it and it's far too early for a one person project to be on Github.
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