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!

2015/burton/README.md

@@ -44,7 +44,7 @@ Finally, if you wish to read the man page:
 
 ## Alternate code:
 
-An alternate version of this entry, [prog.alt.c](prog.alt.c), is provided.
+An alternate version of this entry, [prog.alt.c](%%REPO_URL%%/2015/burton/prog.alt.c), is provided.
 This alternate code is discussed in the "prog.c vs prog.alt.c" section of the
 author's remarks below.