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!

2013/endoh4/README.md

@@ -12,7 +12,7 @@ below) you can do so with the `SIZE` variable. For instance you can do:
     make clobber SIZE=50,50 all
 ```
 
-but you can also do this directly with the [endoh4.sh](endoh4.sh) script as
+but you can also do this directly with the [endoh4.sh](%%REPO_URL%%/2013/endoh4/endoh4.sh) script as
 described below.
 
 
@@ -36,7 +36,7 @@ For more detailed information see [2013 endoh4 bugs](../../bugs.html#2013_endoh4
 
 The second form is preferable as it will temporarily make the cursor invisible
 as recommended by the author. If no file is specified in the `./endoh4.sh` command
-line it will feed to the program [endoh4.c](endoh4.c).
+line it will feed to the program [endoh4.c](%%REPO_URL%%/2013/endoh4/endoh4.c).
 
 
 ## Try:
@@ -70,7 +70,7 @@ If you wish to change the size to `50,50` without passing any arg:
     SIZE=50,50 ./endoh4.sh
 ```
 
-Not specifying a file feeds [endoh4.c](endoh4.c) to the program.
+Not specifying a file feeds [endoh4.c](%%REPO_URL%%/2013/endoh4/endoh4.c) to the program.
 
 
 ## Judges' remarks: