Light mode graphs!!!!

Light mode graphs are now a thing!

To use it,

1. use:

   @wasteof_bot prefer light 

   wob prefer light    | only in /chat

2. Use the graph command as you would normally : @wasteof_bot graph

3. Done!

Also the graphs now look a lot neater! The label crowding is fixed and gridlines are lighter.

More about prefer command here: https://wasteof.money/posts/63f64c74fd891a0d4bd5b581