docs: cut to v0.9.0 with unified .de/.en naming

- Remove all prior release notes and version snapshots (v0.6.0-v0.8.6)
- Rename handbook to *.de.md; keep *.en.md
- New release notes v0.9.0.de.md/.en.md with v0.9.0 snapshot
- generate-docs.mjs: .de/.en convention incl. search index and en-fallback
- docs.tsx: release fallback now uses version.de.md
- Wording: neutral tagline, anonymous user, no gender forms
- Add docs/examples/import-tools.yaml and link from administration docs

docs/releases/v0.9.0/handbook/tool-bearbeiten.en.md

@@ -0,0 +1,32 @@
+
+# Edit & delete tools
+
+## Editing
+
+On the detail page of a tool you will find the **Edit** button
+(only for the person who created the tool, as well as for admins).
+
+The edit page (`/tools/:id/edit`) contains the same fields as when
+creating (name, category, website/icon URL, description, features, tags) —
+already filled with the current values.
+
+- **Save** applies the changes.
+- **Cancel** takes you back to the detail page.
+
+API reference: [`PATCH /tools/{id}`](/docs/reference/endpoints/tools#updateTool).
+
+## Deleting
+
+Via **Delete** on the detail page the tool is removed. The behavior
+depends on your plan:
+
+- **With trash access** (Premium/Enterprise or Admin): the tool is
+  **soft deleted** — it disappears from all public views, but can
+  be restored or permanently deleted in the [trash](/docs/handbook/papierkorb).
+- **Without trash access:** the tool is **permanently** deleted and cannot
+  be restored.
+
+Deletion is only possible for the person who created the tool, as well as
+for admins.
+
+API reference: [`DELETE /tools/{id}`](/docs/reference/endpoints/tools#deleteTool).