Update docs setup

Zebedee Nichollsrequested to merge
update-docs-setup into main

Description

Updates the docs setup to use the new features from mkdocstrings and the relative cross-references from https://github.com/analog-garage/mkdocstrings-python-xref. This needs !25 (merged) to be merged first because it relies on new features in the mkdocs packages.

Checklist

Please confirm that this pull request has done the following:

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

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