Remove link to Just the HM Docs from header?

[rmccue]

Looking at https://humanmade.github.io/webpack-helpers/ there's a G I G A N T I C link to Just the HM Docs in the header, which seems like not the sort of thing I'm interested in while looking at the library. (There's also the theme link in bottom left already.)

My guess is that this is due to the config of aux_links being merged rather than overridden