Use jinja macros instead of includes

Zebedee Nichollsrequested to merge
jinja-macros into main

Description

Way easier to understand now. Still not trivial, but much less magic. See https://jinja.palletsprojects.com/en/3.1.x/templates/#macros

Checklist

Please confirm that this pull request has done the following:

- [ ] Tests added

  • Documentation added (where applicable)
  • Changelog item added to changelog/
Edited by Zebedee Nicholls

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