Switch code, scripts and docs to English; drop plan.md references

Elternbeirat.Web/Services/Page.cs

@@ -0,0 +1,25 @@
+namespace Elternbeirat.Web.Services;
+
+/// <summary>
+/// A static content page, read from a Markdown file in <c>Content/pages/</c>.
+/// The file name (without extension) is the slug.
+/// </summary>
+public sealed class Page
+{
+    /// <summary>
+    /// URL identifier of the page, taken from the file name without umlauts
+    /// (e.g. <c>vorstandsteam</c>). It appears in the route <c>/{slug}</c>.
+    /// </summary>
+    public required string Slug { get; init; }
+
+    /// <summary>
+    /// Display title from the YAML front matter (<c>titel:</c>). Falls back to
+    /// the slug when no title is set.
+    /// </summary>
+    public required string Title { get; init; }
+
+    /// <summary>
+    /// The page body rendered from Markdown to HTML (front matter excluded).
+    /// </summary>
+    public required string ContentHtml { get; init; }
+}