Add more project-wide settings - Added the following settings into presentation-metadata.tex: - \mylanguage - \fourbythreefontsize - \sixteenbyninefontsize - \citationsettings - Load the babel package in preamble.tex, and use \mylanguage to set the language. - Set the font size in {4-3,16-9}/main.tex via the above fontsize commands. - Use above \citationsettings to adjust BibLaTeX behaviour. - Add some documentation to the start of relevant files. - Update documentation regarding presentation-metadata.tex in content/README.md.