Better order for stdlibs in the Julia manual navbar (#60155)
Resolves #50351 albeit with a bit of a hack.
I deliberately left "The Julia REPL" alone (so it is still sorted under
"REPL") as that felt more natural to me compared to sorting it under
"Julia" but obviously this could easily be changed as well.
(cherry picked from commit 9af9b15844705c0d82fcf3ba4878e5e0e2983982)
