Reduce duplication in jinja2 templates #5546
Description
As pages have been introduced over time, they've often liberally borrowed from other templates with the same desired layout/behavior. As such, we are now moderately afflicted with a case of templatus duplicatus. It would likely be worthwhile to do a readthrough of the current templates to see where common functionality could be extracted and packaged into a shared template.
See #5523 (comment) for two examples of template duplication.