Change alg.garron.us links to alg.cubing.net.

This is a minimal commit that changes the important parameters.
I didn't try to refactor anything.

Note that the full escaping mechanism is at: https://github.com/cubing/alg.cubing.net/blob/master/alg.js#L190
I'm eventually going to look into use cases to see if I want to escape other common things, but it's relatively stable for now. In particular, it handles shifting `-` and `_` "out of the way" so that escaped and non-escaped hyphens/underscores can be distinguished (they might be used in commments).