Matematik › Statistik: add “Deskriptiv statistik” umbrella topic and surface it in category navigation

[Copilot]

This PR addresses the Statistik umbrella scope under Matematik by adding a core topic that covers descriptive statistics fundamentals (data representation, key measures, and diagrams) with Danish learner-facing content and quiz material.

• Ny Statistik-kerne under Matematik

  • Added content/matematik/deskriptiv-statistik.ts as a new Topic.
  • Covers:
    • dataindsamling og repræsentation
    • hyppighed/frekvens/kumuleret frekvens
    • middelværdi/median/typetal
    • kvartiler, spredningsmål, varians, standardafvigelse
    • diagramtyper (søjle, cirkel, histogram, boksplot, sumkurve)
    • grupperede observationer og sammenligning af datasæt
  • Includes a focused quiz for interpretation and statistical reasoning.

• Kategori-integration (Matematik › Statistik)

  • Wired the new topic into content/matematik/index.ts:
    • topics: [deskriptivStatistik, lineaerRegression, risikoforhold]
  • Keeps existing Statistik topics intact while adding umbrella-level foundational coverage.

• Documentation alignment

  • Updated README.md to reflect current Statistik topic set under Matematik.

• Example (integration change)

  // content/matematik/index.ts
  import { deskriptivStatistik } from "./deskriptiv-statistik";
  
  // ...
  {
    slug: "statistik",
    title: "Statistik",
    topics: [deskriptivStatistik, lineaerRegression, risikoforhold],
  }

• screenshot

  • 

[rastermanden]

Superseded by #63, which has been merged into main. Content was preserved verbatim and re-authored against the per-category content structure from #61. Closing.

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