Rename demo.sh scripts to try.sh

This is because they are under the try section. I'm aware that there's a
script called try.me.sh but that's not been decided on a name change. It
probably should be changed to try.sh to be consistent and probably will
be but it's not been yet.

The manifest files in tmp/ have been updated as well, including the
macOS Numbers file.

1988/westley/README.md

@@ -23,7 +23,7 @@ code](#alternate-code) section below for how to use the original.
 Also try:
 
 ```sh
-./demo.sh
+./try.sh
 ```
 
 to show the code with followed by the result so you can truly see the magic.