docs: Antora extension setting some AsciiDoc attributes

[themr0c]

Generate version related AsciiDoc attributes at build time rather than maintaining the values in the antora-playbook.yml file

The Antora extension:

1. Gets the version from the Makefile.
2. Sets the AsciiDoc attributes.

fixes #3829

[openshift-ci]

Skipping CI for Draft Pull Request.
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[themr0c]

/retest

[openshift-ci]

@themr0c: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration-crc	80f5da4	link	true	/test integration-crc

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[themr0c]

This could be another route: setting attributes from a YAML file: https://github.com/redpanda-data/docs-extensions-and-macros/blob/main/extensions/add-global-attributes.js

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[gbraad]

please @praveenkumar check if these are the expected fields

[openshift-ci]

New changes are detected. LGTM label has been removed.

[themr0c]

Rebased and squashed.