This isn't actually true. I suggest:

"Many programming languages have their own packaging guidelines. You can find links to these in the navigation bar."

As an aside, the PR method means that if I just want to fix this myself, I would have to merge and then edit afterwards. Which I guess I can just do.

@tibbs looks better now?

I went ahead and did something similar. I didn't see a need for a guideline page with three pages in it, and I don't believe that there's any requirement for navbar entries to all be links, so I just left the "programming languages" page out completely. I also nested the two Python subdocuments under Python itself.

Hopefully this will look correct when the main page is updated.