Independent section on Fiber tracking evaluation not necessary

[Garyfallidis]

We have a section on tracking evaluation with a single tutorial. We can move this tutorial back to the original fiber tracking section there is no need for an independent section just for one tutorial.
See here https://dipy.org/tutorials/

[arokem]

👍 sounds good!

[skoudoro]

Hi @areeshatariq,

Can you fix this issue? Thank you!

[skoudoro]

Just a quick reminder @areeshatariq. It would be good to have PR soon. Thank you!