Remove header "latest ArchivesSpace release" badge in favor of prose on the Getting Started page that auto-updates when a new release is published

[brianzelip]

This PR removes the header “latest ArchivesSpace release” badge and replaces that UX with explicit prose on the Getting Started page.

It also introduces a new automation path so tech-docs can be updated when ArchivesSpace core publishes a release:

Core new release dispatch event ──► Tech Docs workflow
                                      │
                                      ├──► write to src/lib/latestArchivesSpaceRelease.ts
                                      │
                                      └──► open PR ──► human review & merge

System behavior

1. Core publishes a non-prerelease release.
2. Core workflow dispatches new-archivesspace-release event to Tech Docs with:

• tag_name
• html_url

3. Tech Docs receives the dispatched event:

• an Action is triggered when the repo receives the event
  • writes src/lib/latestArchivesSpaceRelease.ts
  • opens/updates a PR in tech-docs

5. Human reviews/merges PR.

Changes made outside this repo

• the aspace-ci-bot access token is used for automated write access to this Tech Docs repo
• A new workflow was added in core to run on release: published and dispatch to tech-docs with release payload fields (see Add workflow to dispatch an event for the Tech Docs repo to consume archivesspace#4015).

Next steps

• Merge this PR in tech-docs first
• Merge the core sender workflow PR
• Initiate a dry-run[0] to verify it works:
  • Action runs in tech-docs on a new-archivesspace-release event, see https://github.com/archivesspace/tech-docs/actions/runs/23760785479
  • PR is created in tech-docs with expected tag & url - see Update latest ArchivesSpace version to v4.2.0 #307

[0] initiate a dry-run via the GitHub cli:

gh workflow run ".github/workflows/new-archivesspace-release.yml" \
  --ref tweak-new-archivesspace-release-workflow \
  -f tag_name=v4.2.0 \
  -f html_url=https://github.com/archivesspace/archivesspace/releases/tag/v4.2.0

References

• Get the latest release
• Create a repository dispatch event
• repository_dispatch event

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