docs/_openvoxdb_8x: Clean up and modernize collection

[miharp]

The `_openvoxdb_8x` collection was ported from PuppetDB docs and needs a systematic
cleanup pass. 95 files, ~1,933 instances of upstream branding to update, plus structural
and content issues found in a thorough audit.

1. Rebrand (highest priority — pervasive) ✅ Done in #207

• Replace `PuppetDB` / `puppetdb` → `OpenVoxDB` / `openvoxdb` across all 95 files
• Update GitHub links from `github.com/puppetlabs/puppetdb` → `github.com/OpenVoxProject/openvoxdb`
• Update Forge module URLs → `https://forge.puppet.com/modules/puppet/openvoxdb\`
• Audit `Puppet®`, `Puppet Labs` references — removed "generated by Puppet®", "Puppet Labs® issue tracker", "Puppet Labs Status API" framing
• Update `CONTRIBUTING.md` — Jira tracker link replaced with GitHub issues
• Replace remaining "PuppetDB" references in `_data/nav/openvoxdb_8x.yml`

Intentionally deferred from rebrand scope:

• Review PE-only feature markers (`ha.markdown` and others marked "PE-only") — clarify which features are available in open-source OpenVoxDB ✅ Done in openvoxdb_8x: remove PE-only HA, sync, and extensions content #217
• Update `puppet.com/docs/puppet/latest/` external links → `/openvox/latest/` equivalents (see comment below for full audit) ✅ Done in openvoxdb_8x: update puppet.com/docs links to openvox equivalents #228

2. Structural fixes (quick wins) ✅ Done in #234

• Remove duplicate: `index.md` and `overview.markdown` have identical content — remove one, keep the other
• Add missing YAML frontmatter to `acceptance_tests.markdown` (currently has none)
• Add missing YAML frontmatter to `configure_postgres.markdown` (currently has none)
• Audit ~22 pages not linked from `_data/nav/openvoxdb_8x.yml` — add them, or decide to intentionally omit them (down from ~62; API v4 query endpoints, PQL/AST docs, tutorials, curl tips, and most wire formats were already added to nav):
  • Operational: `logging.html`, `migration_coordination.html`, `testing_storage_changes.html`, `acceptance_tests.html`
  • Older wire format versions (likely intentional): catalog v6–v8, facts v4, reports v5–v7
  • Missing wire formats: `catalog_inputs_format_v1.html`, `configure_expiration_format_v1.html`
  • Missing query endpoints: `api/query/v4/catalog_inputs.html`, `catalog_input_contents.html`

3. Content accuracy ✅ Done in #239 (pending merge)

• Fix placeholder/corrupted text: `xxxxxz` string in `release_notes_6.markdown`
• Fix `"Puppet DB"` (with space) → `"OpenVoxDB"` in `release_notes_6.3.markdown`
• Update PostgreSQL version support table — updated minimum to PG 14+ (OpenVoxDB 8.x requirement); clarified supported versions
• Remove "Experimental" label on PQL in `api/query/v4/pql.markdown` (PQL is stable)
• Review deprecated Metrics API docs (`api/metrics/v2/jolokia.markdown`) — reviewed; no evidence of formal deprecation, lint-cleaned and updated
• Fix outdated external links:
  • PostgreSQL docs URLs updated from versioned `/static/` paths → `/current/`
  • `puppet.com/docs/puppetdb/latest/configure.html#vardir` in `maintain_and_tune.markdown` — already an internal link, no change needed

4. Release notes cleanup ✅ Done in #240 (pending merge)

• Resolve overlap between `release_notes.markdown` and `release_notes_8.markdown`
• Consolidate to a single `release_notes.markdown` covering only OpenVoxDB-era releases (8.9.0–8.13.0), matching the style used for OpenVox Server release notes
• Remove legacy PuppetDB release notes files (`release_notes_5.2`, `release_notes_6`, `release_notes_6.0`, `release_notes_6.3`, `release_notes_7`, `release_notes_8`, `release_notes_older`) — not linked in nav and out of scope for this project
• Move release notes to the top of the "General information" nav section

Notes

• Old release notes for PuppetDB 1–7 (`release_notes_older.markdown`, `release_notes_5.2.markdown`, etc.) are intentionally left as historical record — no changes needed there
• Technical names kept as-is (verified against https://github.com/voxpupuli/puppet-openvoxdb): service name `puppetdb`, system paths `/etc/puppetlabs/puppetdb/`, database name `puppetdb`, `[puppetdb]` INI section, `storeconfigs_backend = puppetdb`, `reports = store,puppetdb`, `puppetdb.conf` filename

[miharp]

External puppet.com link audit

As part of the rebrand work, audited all puppet.com/docs links in _openvoxdb_8x. A separate PR will update the ones that have OpenVox equivalents.

Will be updated (target page exists in OpenVox docs):

• 14× puppet.com/docs/puppet/latest/ links → /openvox/latest/...
  • lang_exported, lang_resources, lang_relationships, lang_data_undef, lang_data_resource_reference, lang_data_number, lang_containment, format_report, lang_summary, lang_facts_and_builtin_vars, config_file_routes, reporting_about, dirs_confdir, install_pre
• puppet.com/docs/puppetserver/latest/config_file_puppetserver.html → /openvox-server/latest/config_file_puppetserver.html
• puppet.com/docs/puppetdb/latest/configure.html#vardir → /openvoxdb/latest/configure.html#vardir

Keep as external / no OpenVox equivalent found:

• install_puppet.html, configuration.html, type.html, custom_facts.html, puppet_platform.html — not yet present in _openvox_8x
• 4× puppet.com/docs/pe/latest/ links — PE-specific, no OpenVox equivalent

[miharp]

CONTRIBUTING.md dead links (found during PR #228 review)

The Additional Resources section at the bottom of _openvoxdb_8x/CONTRIBUTING.md has several dead/outdated links:

• https://docs.puppet.com/community/community_guidelines.html — 404 (no redirect)
• http://tickets.puppetlabs.com — defunct Jira tracker (already noted as replaced in rebrand openvoxdb_8x: PuppetDB -> OpenVoxDB throughout #207 body text, but this footer still references it)
• http://links.puppetlabs.com/cla — likely dead CLA link
• #puppet-dev IRC channel on freenode.org — freenode is effectively defunct

These should be updated or removed in a follow-on pass. A Vox Pupuli community guidelines equivalent may exist at https://voxpupuli.org.

[miharp]

Section 2 complete — merged in #234

All structural fixes from this section are done:

• Removed duplicate content: deleted overview.markdown, made index.md a real landing page (was a broken symlink), fixed the SUSE typo
• Removed obsolete pages: acceptance_tests.markdown (referenced Puppet's internal AWS infrastructure) and testing_storage_changes.markdown (referenced Leiningen/Clojure internal tooling) — both deleted and removed from nav
• Added missing YAML frontmatter to configure_postgres.markdown
• Nav audit complete: added logging.html, migration_coordination.html, catalog_inputs.html, catalog_input_contents.html, catalog_inputs_format_v1.html, configure_expiration_format_v1.html; removed deleted pages from nav
• Fixed broken links throughout: [config#anchor] invalid reference syntax in migration_coordination.markdown and configure_postgres.markdown, wrong anchor targets, stale overview.html references updated to index.html
• Fixed markdownlint issues on all changed files (MD013 line length, MD007 list indentation)