Expand document collections with Pretext tutorial and simplify library navigation

apps/docs/src/lib/navigation.ts

@@ -1,45 +1,3 @@
-export type Section = {
-  group: string;
-  description: string;
-  label: string;
-  symbol: string;
-};
-export function sectionFor(slug: string): Section {
-  if (slug.includes("endor-purpose"))
-    return {
-      group: "项目讨论",
-      label: "讨论草案",
-      symbol: "○",
-      description: "逐步讨论 Endor 的意义：从程序入口走向用户与 AI 的对象操作。",
-    };
-  if (slug.includes("endor-concepts"))
-    return {
-      group: "架构设计",
-      label: "系统架构",
-      symbol: "◇",
-      description: "从全球入口、区域运行时到对象数据，了解 Endor 的系统架构。",
-    };
-  if (slug.includes("mounting"))
-    return {
-      group: "架构设计",
-      label: "讨论草案",
-      symbol: "◇",
-      description: "探索节点、对象与统一接入协议，记录仍在演进的设计。",
-    };
-  if (slug.includes("figures"))
-    return {
-      group: "图形档案",
-      label: "工具与工作流",
-      symbol: "⌘",
-      description: "从 Python 源码到可编辑 SVG，让图形与文档一起演进。",
-    };
-  return {
-    group: "开始使用",
-    label: "指南",
-    symbol: "↗",
-    description: "搭建本地工作台，添加第一篇文档，了解检查与发布流程。",
-  };
-}
 export type Heading = { id: string; text: string; level: number; line: number };
 export function headingsFor(content: string): Heading[] {
   let fenced = false;