consider streamlining preambles

[beanumber]

I'd recommend either condensing the three preambles into one, or dropping them altogether.

• The Common preamble is all commented out, so it's not actually doing anything.
• The only difference between the Arxiv and the DeGruyter template is the use of dgjournal. I'd recommend just moving this stuff into template.tex.
• Why does this package need to support the arXiv version? This seems like it is beyond the scope of this pull request. An arXiv template seems like it should be it's own rticles template, not a piggy-back on the degruyter template

So I think if you move the preamble material into template.tex, forget about the arXiv, and get rid of all of the preambles, you'll have a cleaner contribution.

[bmacGTPM]

Ok I cleaned it up. When I tried moving the stuff from the preambles to the template.tex, the changes weren't being recognized. I finally realized that I should have had output: rticles::degruyter_article instead of output: pdf_document in skeleton.rmd. So I changed that, and it's seems to be working.

The nice thing about it is that now we don't have to keep the front matter commented out. It simply ignores title, author, etc., because I edited template.tex so that there is no \title, \author, etc. anywhere.

There's no need to have the arXiv stuff that I had so I removed it. You can switch to knit as pdf_document and the front matter will show up, which is good enough for now.

It might be worth creating an arxiv_article template though. The pdf_document output might be good enough for arXiv, or it might need some tweaks. I'll look into it after this degruyter template is done.

[beanumber]

Is that for blinding? How about if we add an option to blind?

[bmacGTPM]

Would be useful for other output formats. I think it may not do anything with degruyter_article because the degruyter tex package will ignore title/author/etc. Even for the final submission those aren't allowed in the document. They are entered on the website instead.