Navbar "Documentation" too wide and some docs don't highlight the entry

Visit https://common-lisp.net/project/cmucl/doc/index.html. The highlighting for "Documentation" uses a larger font and it's too wide for the navbar. Probably want to make it wider. (I used Firefox for this; seems ok in Chrome, but the fonts between the two are different.)

Also some of the file in the docs subdirectory don't highlight this entry in the navbar like they should.