Rewrite Listmonk deployment guide to follow APP-GUIDES authoring guidelines

[Copilot]

• Review APP-GUIDES.instructions.md and example guides
• Create English version of Listmonk deployment guide (docs/guides/apps/listmonk.md)
• Rewrite German version to follow APP-GUIDES structure
• Ensure both versions follow proper structure:
  • Front matter (sidebar_label, description - no title)
  • H1 title: "Running Listmonk"
  • Introduction section with app description and official docs quote
  • Prerequisites section with correct PostgreSQL guide link
  • "How do I start the container?" section with subsections:
    • Using Terraform (Recommended) - with correct .image attribute references
    • Using mStudio UI (detailed walkthrough with ssl_mode)
    • Alternative: mw container run (with ssl_mode)
    • Alternative: mw stack deploy (with ssl_mode)
  • Operation/Post-deployment section
    • Assign Domain section with urgent security warning
    • Database Setup section (with ssl_mode)
    • Backups section
  • Further Resources section
• Use proper formatting (bold for UI elements, proper callouts, etc.)
• Add urgent security warnings for immediate admin account creation
• Ensure Docker image is properly referenced with Docker Hub link
• Implement idempotent initialization matching official docker-compose format
• Use consistent command format: ["sh", "-c", "..."] without entrypoint modification
• Fixed Terraform to use .image attribute instead of .name
• Added LISTMONK_db__ssl_mode = "disable" to all deployment variants
• Standardized heading anchor IDs across English and German versions
• All H3 headings now have explicit anchor IDs
• Anchor IDs are consistent between English and German (e.g., both use #terraform, #mstudio-ui, etc.)
• Remove manual post-installation steps (no longer needed)
• Run code review (passed with no comments)
• Run security scanning (no issues found)

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[martin-helmich]

@copilot you're using the heading anchor IDs inconsistently, contrary to your explicit instructions.

1. Have heading anchors for all subheadings
2. Should be the same in the german translation as in the english original

[Copilot]

Fixed! Standardized all heading anchor IDs:

1. Added anchor IDs to all H3 headings in both languages:

   • #terraform
   • #mstudio-ui
   • #mw-container-run
   • #mw-stack-deploy
   • #database-setup
   • #backups

2. Made H4 anchor IDs consistent between English and German:

   • #entrypoint-and-command (was #ui-entrypoint-and-command in EN, #ui-entrypoint-und-command in DE)
   • #volumes (was #ui-volumes)
   • #environment-variables (was #ui-environment-variables in EN, #ui-umgebungsvariablen in DE)

3. Fixed H2 anchor consistency:

   • Changed German #domain-zuweisen to #assign-domain to match English
   • Changed German #datenbank-setup to #database-setup to match English

All anchor IDs are now technical/English-based and identical across both language versions for stable linking.

Commit: 29e266d