chore(web): move site under packages

packages/web/lib/docs-source.ts

@@ -0,0 +1,9 @@
+import { DOC_SOURCES } from "./docs-content.generated"
+
+export function loadDocSource(file: string): string {
+  const source = DOC_SOURCES[file]
+  if (source === undefined) {
+    throw new Error(`Unknown doc file: ${file}`)
+  }
+  return source
+}