Example gallery entry on aligning cutouts with reproject_to

[wtbarnes]

Using reproject_to and propagate_with_solar_surface in sunpy, it is very straightforward to reproject many images to a single WCS in order to create a stack of coaligned images that track a single frame while accounting for solar rotation. An example of this is given in this set of slides: https://wtbarnes.github.io/scipy-2023-talk/#/transforming-data-with-sunpy-1

We should provide an example gallery entry of how to do this with sunpy as this is a very common analysis task with AIA data. It also illustrates that you can do this cutout and co-alignment procedure all in one step with reproject and without having to call register on each frame.

[wtbarnes]

See also sunpy/sunpy#7676