Option to include a category for repos without a recognized language on languages card

### Is your feature request related to a problem? Please describe.

I've got a couple of repos where Github's library doesn't recognize the language. The languages card makes it look like 100% of my repos are in the 5 known languages used in the majority, but not all, of my repos.

### Describe the solution you'd like

As my single most-starred repo is a complex Excel workbook, which Github doesn't recognize as having a "languages" because Excel isn't in the Linguist library it use, I'd sure like to at least see a figure included for "Other" or "Unrecognized Primary language" or something like that, just like the figures for each recognized language.

Is there no way you can count the quantity or size of my total repos, then subtract the total for repos found with identifiable Primary Languages from it, to get the unidentifiable languages figures?

### Describe alternatives you've considered

Right now, the only answer I can think of is to not use the language card, because it misrepresents my repos as 100% containing only projects with recognized languages.

### Additional context


Thanks! Great project otherwise, by the way, thanks for your work on this.