docs: add ocis 8.0.6 release notes

[mmattel]

This PR will add the release notes for ocis 8.0.6

[DeepDiver1975]

Code Review: add ocis 8.0.6 release notes

Note: The PR description already flags this as a draft ("the current ones are just c/p and used as templates") — the findings below confirm the placeholder content and shouldn't merge as-is.

Blocking (correctness)

• Both bullets are duplicated verbatim from the existing 8.0.5 section. The file already contains these identical entries under 8.0.5:

  • Security: Bump Go to 1.25.11: …/pull/12446[#12446]
  • Bugfix: Education user delete no longer 404s… …/pull/12395[#12395]

  These belong to 8.0.5; real 8.0.6 changes need to be substituted.

• Version regression: 8.0.5 already reports "Bump Go to 1.25.11", so an 8.0.6 entry bumping Go to the same 1.25.11 is meaningless.

• Reused PR reference #12446: in the 8.0.5 block #12446 is linked for both the Go bump and the libvips upgrade (a pre-existing copy-paste error), and the new 8.0.6 Go entry inherits that same likely-wrong link.

Style / conventions — all good

• Section placement preserves descending-version order (8.1.0 → 8.0.6 → 8.0.5). ✓
• Link formatting ({ocis-releases-url}/v8.0.6[…, window=_blank] and bare PR URLs) matches surrounding sections. ✓
• [discrete] === Issues Fixed structure consistent with sibling patch sections. ✓

Non-blocking

• Branch name typo: add_ocis_8.6.0_release_notes should be 8.0.6.
• Docs-only, no CI/test concerns; a local asciidoctor/Antora build to confirm link rendering is worthwhile but nothing changes anchors/aliases.

Recommendation

Hold for revision — replace the two placeholder entries with the actual 8.0.6 changes and fix the #12446 reference. Structure, placement, and formatting are all correct and ready to receive the real content.

[mmattel]

This PR should be on draft because unfinished. Accidentially was not set to, set to draft now.