fix topbar to work on mobile devices

The topbar, by way of JavaScript, now works
on mobile devices such as cell phones and
tablets.

Internal links for entries from 1984 thru 2015
have been adjusted.

Ran `make www` to perform the above.

TODO: Fix some color issues on topbar.

TODO: More testing!

2018/anderson/README.md

@@ -24,7 +24,7 @@ code](#alternate-code) below for more details.
 
 ## Alternate code:
 
-Compare [prog.c](prog.c) and [prog.alt.c](prog.alt.c) and find out why we had to
+Compare [prog.c](%%REPO_URL%%/2018/anderson/prog.c) and [prog.alt.c](%%REPO_URL%%/2018/anderson/prog.alt.c) and find out why we had to
 modify the entry, and what confused the author (see the author's remarks).  No,
 it was not the shape of the Roman V that we, or the compiler, didn't like.