feat: generate doc pages from markup

src/lib/documentation.shared.ts

@@ -0,0 +1,28 @@
+/// Types
+
+export interface Document {
+  title: string;
+  // HTML
+  content: string;
+}
+
+export interface DocumentInfo {
+  title: string;
+  slug: string;
+}
+
+// A tree representing the `docs` folder.
+export interface DocsTree {
+  // index.whatever
+  index: DocumentInfo;
+  // Everything except index.whatever
+  nodes: DocsTreeNode[];
+}
+
+export type DocsTreeNode = DocsTree | DocumentInfo;
+
+/// Functions
+
+export function is_tree(node: DocsTreeNode) {
+  return node.hasOwnProperty('nodes');
+}