Add a transform and Quaternion example section.

[jak6jak]

How can Bevy's documentation be improved?

Currently there is not really a specific place to add transformation examples other than 2d or 3d. I think this would encourage more examples to be created about this topic.

Examples that could be included:

• translation of object
• rotation of objects
• scaling of objects
• translation, rotation, and scaling at the same time
• show the difference between global transform and Transform
• the 3d parenting example could be moved into here.
• more examples showcasing the various methods on Transform and Quaternion.

[alice-i-cecile]

This is largely complete, so I'm going to close it out :)