Add easy switch to build camera ready version after paper was accepted

[AntonLydike]

It would be nice if one could easily change the make target after the paper is accepted so it continues to build the most relevant files.

I guess there would be some behind-the-scenes magic involved in making the readme and such still point to the right files, but I'm sure we can figure that out!

[tobiasgrosser]

I don't understand what you want. We already build paper.pdf and paper-submission.pdf: #43.

What else would you like to build? We had at some point a version that builds without anonymous authors. However, as there are plenty of edits needed for the camera ready version and the if-def chaos had quite some cost, this was dropped. Are you suggesting to add this back?

[AntonLydike]

My understanding is, that after the paper is accepted, we switch to make cameraACM or in our case make asplos24 as the thing we are actually interested in building. But CI will continue to build paper.pdf.

I would like to maybe just have a simple section explaining how one can switch make paper out for another target (that will produce a differently named file), and still get the CI builds and quick links in the readme to work.