docs: standardise filenames to ASCII kebab-case + ISO date prefix

Adopt one filename convention everywhere except hardware host pages
(those are pinned to their hostnames by the index validator):

  - ASCII lowercase
  - kebab-case word separator
  - dated docs: YYYY-MM-DD-label.md (hyphen between date and label)
  - English regardless of content language

Renames:
  docs/makerFLOSS_house_rules.md                        -> docs/house-rules.md
  docs/infrastruktur/                                   -> docs/infrastructure/
  docs/infrastructure/vps-og-dns.md                     -> docs/infrastructure/vps-and-dns.md
  docs/presentations/2026-05-11_messaging.md            -> docs/presentations/2026-05-11-messaging.md
  docs/presentations/2026-05-11_SoMe-taxonomi.md        -> docs/presentations/2026-05-11-social-media-taxonomy.md
  notes/todo/2026-04-14_todo.md                         -> notes/todo/2026-04-14-todo.md
  notes/todo/OM_services.md                             -> notes/todo/om-services.md
  notes/todo/indkøbsliste.md                            -> notes/todo/wishlist.md
  notes/communications/2026-03-16_facebookpost.md       -> notes/communications/2026-03-16-facebook-post.md

Other touches:
- Document the convention in CLAUDE.md under Working Norms.
- Refresh the stale Repository Structure block in CLAUDE.md to reflect
  the docs/ vs notes/ split introduced in f6d589e.
- Update the House rules link in docs/index.md and the nav entry in
  mkdocs.yml to the new house-rules.md path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -8,7 +8,7 @@ This is a **documentation-only repository** for the MakerFLOSS initiative at Ora
 
 ## Working Norms
 
-From `notes/todo/2026-04-14_todo.md`:
+From `notes/todo/2026-04-14-todo.md`:
 
 - **Language**: English for code, docs, commits (meeting notes may be in Danish)
 - **Git**: Trunk-based development, feature branches, simple commit messages
@@ -17,15 +17,21 @@ From `notes/todo/2026-04-14_todo.md`:
 - **AI**: Allowed but reviewed; no secrets in commits
 - **Decisions**: Lightweight markdown decision logs
 - **License**: FLOSS by default
+- **Filenames**: ASCII lowercase, kebab-case (`like-this.md`), English regardless of content language. Dated docs use an ISO prefix joined with a hyphen: `YYYY-MM-DD-label.md`. Hostnames are the exception — `docs/hardware/*.md` must equal the host's `hostname` (enforced by `scripts/gen_overview.py`).
 
 ## Repository Structure
 
 ```
-docs/
-  infrastruktur/   # Infrastructure documentation (VPS, DNS, etc.)
-  kommunikation/   # Communication materials (Facebook posts, announcements)
-  møder/           # Meeting notes
-  todo/            # Task lists and working norms
+docs/             # everything here is built and shipped to docs.makerfloss.eu
+  hardware/       # auto-indexed per-host frontmatter (mf00..mf03, makerfloss.eu)
+  infrastructure/ # labdesign, VPS/DNS, etc.
+  presentations/  # Marp decks (build-slides.sh)
+notes/            # repo-only working material, not built
+  meetings/       # meeting notes (Danish allowed)
+  todo/           # task lists, working norms, wishlist, services
+  dev/            # internal plans/ and specs/
+  communications/ # community comms artifacts (Facebook posts, etc.)
+sandbox/          # scratch / pipeline fixtures (e.g. test-mermaid.md)
 ```
 
 ## Infrastructure

docs/index.md

@@ -8,7 +8,7 @@ jam-session community focused on self-hosted, open-source infrastructure.
 
 - [Hardware](hardware/index.md) — every machine in the lab, auto-indexed from per-host
   frontmatter blocks. Use this when planning where to deploy a new service.
-- [House rules](makerFLOSS_house_rules.md) — working norms, governance, and
+- [House rules](house-rules.md) — working norms, governance, and
   what we do (and don't) do.
 
 ## Working norms (summary)

mkdocs.yml

@@ -55,4 +55,4 @@ nav:
   - Home: index.md
   - Hardware:
       - hardware/index.md
-  - House rules: makerFLOSS_house_rules.md
+  - House rules: house-rules.md