Minor doc/tutorial additions.

[garrettwrong]

Just noticed we did not entirely update the docs/tutorials for some additions at the last release (Coef and SDP for example).

https://computationalcryoem.github.io/ASPIRE-Python/auto_tutorials/aspire_introduction.html#pipeline-roadmap

I'll try to skim through docs and make a few touch ups.

[garrettwrong]

Also, it looks like several of our ImageSource method documentation no longer parse into sphinx docs.

https://computationalcryoem.github.io/ASPIRE-Python/aspire.source.html#aspire.source.image.ImageSource.normalize_background

[garrettwrong]

Also, it looks like several of our ImageSource method documentation no longer parse into sphinx docs.

https://computationalcryoem.github.io/ASPIRE-Python/aspire.source.html#aspire.source.image.ImageSource.normalize_background

I think we may need to use a functools wrapper to ensure that the docstring is passing through the decorated function. I have not confirmed yet (todo); ran into mention of something similar looking up some info in the python standard library documentation.

[garrettwrong]

Piggybacking on this issue. Another small item from the demo prep, remove the final superflous ArrayImageSource call in pipeline. PR incoming.