Update Citation Style Configuration

[tadean]

What is the problem that we want to solve?

In the 2.6 update of seboettg/citeproc-php, the package has begun using the newly available packages citation-style-language/styles and citation-style-language/locales. Previously these had to be installed by hand as the repositories were not available on packagist, so were not really available to the quickstart build process.

The availability of these packages may mean some changes to our citation style configuration would be beneficial.

Conditions of satisfaction

Now that these packages are available, we should consider if any revisions are needed to our process for including styles and locales in our citation styles. At minimum, we can likely stop using academicpuma/locales - this older package was in use as a stopgap because the citation locale repository was not yet available on packagist.

Our custom style entities currently contain the actual xml of the style - we may wish to consider instead referencing a style name in the citation-style-language/styles package.