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/burton1/README.md

@@ -24,7 +24,7 @@ code](#alternate-code) below.
 
 ## 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%%/2018/burton1/prog.alt.c), is provided
 This alternate code was supposed to compile without warnings, however
 with modern compilers this is no longer the case so it will only cleanly compile
 with `-Wno-` options.
@@ -51,7 +51,7 @@ One line, one array, one loop and one statement but it prints many bytes. It won
 
 Feed this anything on `stdin`.
 
-The [included script.sh](scripthd.sh) may be used as a driver program for this entry.
+The [included script.sh](%%REPO_URL%%/2018/burton1/scripthd.sh) may be used as a driver program for this entry.
 It adds several nice-to-have features, and allows salt-to-taste customizability.
 
 This code has been compiled and tested on:
@@ -251,7 +251,7 @@ So which version is the shortest, portable hex dump?
 Clearly, the smallest possible program violates modern best practice.
 It is not even possible to compile cleanly, but it will compile correctly.
 
-Included is [prog.alt.c](prog.alt.c), a modern C implementation that is --
+Included is [prog.alt.c](%%REPO_URL%%/2018/burton1/prog.alt.c), a modern C implementation that is --
 perhaps -- the smallest, clean-compiling version using `clang` or `gcc` with
 `-Wall -pedantic`.  Note that while this is larger than all but the original
 attempt, it will *not* work with the original Ritchie PDP-11 C compiler, since