1996 fixes and updates

Update the README.md files - at least with those not in a previous
commit. The updates mostly include formatting (make them markdown) but
probably also typos here and there. More probably has to be done with
these files.

The 1996/august/.gitignore was updated as well with a file that is
generated by one of the suggested commands.

1996/eldby/README.md

@@ -14,6 +14,10 @@
 
 	./eldby 
 
+WARNING: on modern systems this is very fast and could be a problem for those
+susceptible to photosensitivity. Please try this one with caution if this
+applies to you! The same goes for people who can be overstimulated.
+
 ## Judges' comments
 
 We were impressed by the author's ability to render spheres in 3D