standalone release notes section

[heskew]

reworking the release notes to be an unversioned section of docs. cleaning up current versioned release notes will come in a followup pr.

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initial spike description:

getting an idea of what could work...ux feels a little rough (how many places does it need to say 'release notes') but dx improved. one possible direction for #249. this essentially puts a single copy of all release notes at /release-notes, outside of the versioned docs, and removes the sidebar_position from each release note (sidebar pos handled differently here).

in absence of a pr preview this can be previewed locally with a few steps:

1. download the github-pages build artifact for this pr, https://github.com/HarperDB/documentation/actions/runs/17059205301?pr=266#artifacts
2. extract and open artifact
3. create/empty build dir in local documentation repo
4. copy artifact contents into local build dir
5. run npm run serve
6. browser should open to localhost:3000. go to http://localhost:3000/release-notes

[Copilot]

Pull Request Overview

This PR introduces a standalone release notes section outside of versioned documentation, creating a dedicated unversioned documentation area for release notes. The changes restructure how release notes are organized and accessed, moving them from the versioned docs structure to their own independent section.

• Creates a new standalone release notes documentation plugin at /release-notes
• Reorganizes all release notes from v1-v4 into version-specific folders with proper hierarchy
• Updates navigation to include a dedicated Release Notes link in the main navbar

Reviewed Changes

Copilot reviewed 145 out of 149 changed files in this pull request and generated 3 comments.

File	Description
sidebarsReleaseNotes.ts	Creates new sidebar configuration for standalone release notes with version-based categories
release-notes/**/*.md	Migrates all release notes from v1 through v4 into new organized folder structure
redirects.ts	Adds structure for release notes redirects and reorganizes redirect generation
docusaurus.config.ts	Configures new release notes documentation plugin and adds navbar link

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[heskew]

getting this in now, ahead of the next release note(s)

[kriszyp]

haha, this is awesome! Well, now I better get to work on 4.5.24 release notes! thank you!