remove references to older schema drafts

[mkhraisha]

fixes #239 by removing all references to Schema Draft 2019 except in the Indeterminate evaluation section:

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[iherman]

The issue was discussed in a meeting on 2025-01-29

• no resolutions were taken

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2.1. remove references to older schema drafts (pr vc-json-schema#243)

See github pull request vc-json-schema#243.

Ivan Herman: +1 to remove older schemas.

Brent Zundel: This is a straightforward PR. I encourage people to view it.
… Our standard work mode is if there are no concerns raised after a week, the PR can be merged.

Michael Jones: Don't we also require a few approvals?

Brent Zundel: Yes.
… If anyone has concerns after a PR has been merged, we can always unmerge it.

Ivan Herman: Mahmoud, when you create the PR adding yourself as an editor, please also update the code owners.

[brentzundel]

open for sufficient review, multiple approvals, no objections, merging.